merge in media-preview stuff

Squashed commit of the following:

commit 4087cee2f2a72bc2d3e44832809cbe99d25a3309
Author: rabite <rabite@posteo.de>
Date:   Tue May 21 20:40:27 2019 +0200

    rename to preview-gen

commit 275fd420a01c24393ae9cc07287204fde309130a
Author: rabite <rabite@posteo.de>
Date:   Tue May 21 20:30:50 2019 +0200

    update Cargo.toml and README

commit bf4c3fec0f8e0ff4628153297ac64fe165b4e443
Author: rabite <rabite@posteo.de>
Date:   Tue May 21 20:30:33 2019 +0200

    add config options for media

commit 3bf681cd078177d634507c51d04a45bdae184f1b
Author: rabite <rabite@posteo.de>
Date:   Tue May 21 13:46:00 2019 +0200

    always use unicode icons for play/pause/mute

commit ed2a0b31d1911e4d42086699ca1db636c327bacf
Author: rabite <rabite@posteo.de>
Date:   Tue May 21 13:04:11 2019 +0200

    rename to mediaview and some fixups

commit bda3f8f83bec07c3f52d06cf5f8eaad7fdbd85a0
Author: rabite <rabite@posteo.de>
Date:   Tue May 21 11:44:52 2019 +0200

    fix warnings

commit 9c917903cfa958b225f268ed4fb9f55f27162be0
Author: rabite <rabite@posteo.de>
Date:   Tue May 21 01:10:58 2019 +0200

    play audio through viedo widget

commit 9fe208b213710fae889f7701bdb3bf96d599c9a8
Author: rabite <rabite@posteo.de>
Date:   Tue May 21 00:15:12 2019 +0200

    fixed play when autoplay is off

commit d4036d52864d0a4e08f7da2cf6f7419ef070c1a9
Author: rabite <rabite@posteo.de>
Date:   Mon May 20 13:15:44 2019 +0200

    add icons for play/pause/mute

commit 29f0d203cfd7501b50d80501de146da9d89388bb
Author: rabite <rabite@posteo.de>
Date:   Mon May 20 12:26:53 2019 +0200

    add basic gif support

commit 8d28e4c23a91b0ef83739554c3a2f6671a9ff6f5
Author: rabite <rabite@posteo.de>
Date:   Mon May 20 11:43:57 2019 +0200

    fixed play after pause

commit 142017df78de77bcfffd8f3dd9612a06927e183b
Author: rabite <rabite@posteo.de>
Date:   Sun May 19 14:22:16 2019 +0200

    change to stale on drop

commit c0026c7f56f6a841df18e41bd1c9b33543e26cfb
Author: rabite <rabite@posteo.de>
Date:   Sat May 18 23:46:27 2019 +0200

    handle errors in gstreamer closure

commit ef37f872c54b9d21ed5505c2edb480c793afaef9
Author: rabite <rabite@posteo.de>
Date:   Sat May 18 23:40:24 2019 +0200

    add image-only mode to preview-gen

commit 15752464563463c6ecf892c1d8a14651bf32e1e5
Author: rabite <rabite@posteo.de>
Date:   Sat May 18 23:28:33 2019 +0200

    add copyright note

commit 4c9f08fc4de5d3bffefd42284b60aa81cfbae9f7
Author: rabite <rabite@posteo.de>
Date:   Sat May 18 23:27:30 2019 +0200

    make image/video previews optional

commit 9c2c2db2b20ecd4c30acbb1c77ad18c71f528c4c
Author: rabite <rabite@posteo.de>
Date:   Sat May 18 22:13:25 2019 +0200

    remove blank space under video

commit f7056d70fbe9147b3b95d7c10950653eadbb4f48
Author: rabite <rabite@posteo.de>
Date:   Sat May 18 22:06:49 2019 +0200

    remove dbg

commit cce820657ff1258cdb78d455dd3cf04564450cea
Author: rabite <rabite@posteo.de>
Date:   Sat May 18 21:50:25 2019 +0200

    added error handling to preview-gen

commit 80bbe15bacb99d1f4f97504a5d10ecf59544993f
Author: rabite <rabite@posteo.de>
Date:   Sat May 18 21:04:31 2019 +0200

    add time and visual seek bars to videoview

commit 4349945cc5549334f246be64bc7c8e2db43f9150
Author: rabite <rabite@posteo.de>
Date:   Thu May 16 22:39:19 2019 +0200

    fix sneaky process

commit 373128b7096d4de29924617e549a613a3aeea5b2
Author: rabite <rabite@posteo.de>
Date:   Thu May 16 22:07:27 2019 +0200

    fix out of controll processes

commit e061e065e913ab3923ffac1079a9f0a2be0df532
Author: rabite <rabite@posteo.de>
Date:   Thu May 16 20:51:56 2019 +0200

    add media_preview

commit f68c754895a9718d1a962980de9fbf02e5cb48cd
Author: rabite <rabite@posteo.de>
Date:   Thu May 16 19:37:04 2019 +0200

    beta image/video previews

commit 9a5460e553dd26ebccffaf819c64a8dc6ba74818
Author: rabite <rabite@posteo.de>
Date:   Tue May 14 20:36:25 2019 +0200

    external img preview

commit 3c4edfcb7611b36f6e537c73743e0b6bd269037b
Author: rabite <rabite@posteo.de>
Date:   Tue May 14 20:35:12 2019 +0200

    video preview

13 files changed, 1621 insertions, 77 deletions

diff --git a/Cargo.lock b/Cargo.lock
index 83775f8..6c24026 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1,6 +1,11 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
 [[package]]
+name = "adler32"
+version = "1.0.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
 name = "aho-corasick"
 version = "0.7.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -40,13 +45,11 @@ dependencies = [
 
 [[package]]
 name = "async_value"
-version = "0.2.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
+version = "0.2.3"
 dependencies = [
  "failure 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "failure_derive 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
- "objekt 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "rayon 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -92,6 +95,11 @@ dependencies = [
 ]
 
 [[package]]
+name = "byteorder"
+version = "1.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
 name = "bytesize"
 version = "0.1.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -125,6 +133,11 @@ dependencies = [
 ]
 
 [[package]]
+name = "color_quant"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
 name = "constant_time_eq"
 version = "0.1.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -161,6 +174,15 @@ dependencies = [
 ]
 
 [[package]]
+name = "deflate"
+version = "0.7.19"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "adler32 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "byteorder 1.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
 name = "dirs"
 version = "1.0.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -262,18 +284,149 @@ version = "0.3.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
+name = "gif"
+version = "0.10.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "color_quant 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lzw 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "glib"
+version = "0.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "glib-sys 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gobject-sys 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "glib-sys"
+version = "0.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "pkg-config 0.3.14 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "gobject-sys"
+version = "0.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "glib-sys 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "pkg-config 0.3.14 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "gstreamer"
+version = "0.11.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cfg-if 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "glib 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "glib-sys 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gobject-sys 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gstreamer-sys 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "muldiv 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num-rational 0.1.42 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "gstreamer-app"
+version = "0.11.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "glib 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "glib-sys 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gobject-sys 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gstreamer 0.11.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gstreamer-app-sys 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gstreamer-base 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gstreamer-base-sys 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gstreamer-sys 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "gstreamer-app-sys"
+version = "0.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "glib-sys 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gstreamer-base-sys 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gstreamer-sys 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "pkg-config 0.3.14 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "gstreamer-base"
+version = "0.11.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "glib 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "glib-sys 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gobject-sys 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gstreamer 0.11.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gstreamer-base-sys 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gstreamer-sys 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "gstreamer-base-sys"
+version = "0.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "glib-sys 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gobject-sys 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gstreamer-sys 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "pkg-config 0.3.14 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "gstreamer-sys"
+version = "0.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "glib-sys 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gobject-sys 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "pkg-config 0.3.14 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
 name = "hunter"
 version = "1.1.4"
 dependencies = [
  "alphanumeric-sort 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "async_value 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "async_value 0.2.3",
  "chrono 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "dirs-2 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "failure 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "failure_derive 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gstreamer 0.11.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gstreamer-app 0.11.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "image 0.21.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
  "lscolors 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "mime_guess 2.0.0-alpha.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "notify 4.0.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "osstrtools 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "parse-ansi 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -288,6 +441,31 @@ dependencies = [
 ]
 
 [[package]]
+name = "image"
+version = "0.21.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "byteorder 1.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gif 0.10.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "jpeg-decoder 0.1.15 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lzw 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num-iter 0.1.37 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num-rational 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num-traits 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "png 0.14.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "scoped_threadpool 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tiff 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "inflate"
+version = "0.4.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "adler32 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
 name = "inotify"
 version = "0.6.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -315,6 +493,15 @@ dependencies = [
 ]
 
 [[package]]
+name = "jpeg-decoder"
+version = "0.1.15"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "byteorder 1.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rayon 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
 name = "kernel32-sys"
 version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -360,6 +547,11 @@ dependencies = [
 ]
 
 [[package]]
+name = "lzw"
+version = "0.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
 name = "memchr"
 version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -378,6 +570,25 @@ version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
+name = "mime"
+version = "0.3.13"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "unicase 2.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "mime_guess"
+version = "2.0.0-alpha.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "mime 0.3.13 (registry+https://github.com/rust-lang/crates.io-index)",
+ "phf 0.7.24 (registry+https://github.com/rust-lang/crates.io-index)",
+ "phf_codegen 0.7.24 (registry+https://github.com/rust-lang/crates.io-index)",
+ "unicase 1.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
 name = "mio"
 version = "0.6.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -418,6 +629,11 @@ dependencies = [
 ]
 
 [[package]]
+name = "muldiv"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
 name = "net2"
 version = "0.2.33"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -464,6 +680,16 @@ dependencies = [
 ]
 
 [[package]]
+name = "num-derive"
+version = "0.2.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "proc-macro2 0.4.30 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 0.6.12 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.34 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
 name = "num-integer"
 version = "0.1.39"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -472,6 +698,33 @@ dependencies = [
 ]
 
 [[package]]
+name = "num-iter"
+version = "0.1.37"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "num-integer 0.1.39 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num-traits 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "num-rational"
+version = "0.1.42"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "num-integer 0.1.39 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num-traits 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "num-rational"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "num-integer 0.1.39 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num-traits 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
 name = "num-traits"
 version = "0.2.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -490,11 +743,6 @@ version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
-name = "objekt"
-version = "0.1.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
-[[package]]
 name = "ordermap"
 version = "0.3.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -559,6 +807,57 @@ dependencies = [
 ]
 
 [[package]]
+name = "phf"
+version = "0.7.24"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "phf_shared 0.7.24 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "phf_codegen"
+version = "0.7.24"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
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@@ -587,6 +886,33 @@ dependencies = [
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+source = "registry+https://github.com/rust-lang/crates.io-index"
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+
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@@ -600,6 +926,32 @@ version = "0.4.0"
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+dependencies = [
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@@ -613,6 +965,23 @@ dependencies = [
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+source = "registry+https://github.com/rust-lang/crates.io-index"
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+
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@@ -729,6 +1098,11 @@ dependencies = [
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 [[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+
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@@ -798,6 +1172,17 @@ dependencies = [
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+source = "registry+https://github.com/rust-lang/crates.io-index"
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@@ -825,6 +1210,22 @@ version = "0.1.3"
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+version = "1.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
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+
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+dependencies = [
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+]
+
+[[package]]
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@@ -848,6 +1249,11 @@ version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
+name = "version_check"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
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@@ -904,26 +1310,29 @@ dependencies = [
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