Release Newsboat 2.21

Lists below only mention user-visible changes, but the full list of contributors
for this release also includes Ivan Tham.

Added
=====

- Build dependency on AWK
- A note that security vulnerability should be reported to
    security@newsboat.org, preferably encrypted to PGP key 4ED6CD61932B9EBE
- Confirmation before marking all feeds as read (#1006) (Dennis van der Schagt)
- `scrolloff` setting which keeps the specified number of lines above and below
    the selected list item (#1103) (Dennis van der Schagt)
- `%=[width][identifier]` formatting sequence for `*-format` settings. It
    centers a given value inside a given width, padded with spaces and slanting
    to the left if it can't be aligned evenly (Daniel Bauer)
- Support for Miniflux (#448) (Galen Abell)
- `run-on-startup` setting which executes a given list of operations when
    Newsboat starts. This can be used to e.g. open tag dialog on startup, or go
    to a certain feed (#888) (Dennis van der Schagt)
- Documentation for `one`, `two`, ..., `nine`, `zero` operations that open
    a corresponding URL in the browser (A1RO)

Changed
=======

- It is now a startup error for a macro to have no operations
- Bumped minimum supported Rust version to 1.42.0
- Updated vendored libraries: Catch2 to 2.13.1, json.hpp to 3.9.1
- Empty strings in filter expressions are treated as zero when compared with
    a numeric attribute like `age` (Alexander Batischev)
- Converted various tables in docs to decorated lists, making them easier to
    read (#441) (Spacewalker2)
- In macros, no longer require a space between operation and the following
    semicolon (#702) (Dennis van der Schagt)
- Sorting by first tag now ignores "title tags", i.e. the ones that start with
    a tilde (#1128) (José Rui Barros)
- contrib/feedgrabber.rb updated to use Newsboat directories instead of
    Newsbeuter's (Fabian Holler)
- Updated translations: Dutch (Dennis van der Schagt), German (Lysander
    Trischler), Polish (Carno), Russian (Alexander Batischev), Turkish (Emir
    Sarı), Ukrainian (Alexander Batischev)

Fixed
=====

- TT-RSS not taking the MIME type into account when deciding what enclosure to
    pick (#941) (chux0519)
- Typos in documentation (Edgar Hipp)
- History files storing the *oldest* entries instead of the most recent ones
    (#1081) (Dennis van der Schagt)
- Search dialogs all displaying results of the last search, not their individual
    searches (#1087) (Dennis van der Schagt)
- Feeds apparently not being sorted after a reload (#1089) (Alexander Batischev)
- Search dialog displaying the new query even if the search failed (Dennis van
    der Schagt)
- `delete-all-articles` operation not working in the search dialog (Dennis van
    der Schagt)
- First feed marked as read when deleting all items in search dialog (Dennis van
    der Schagt)
- Arrow keys not working in the tag list (Dennis van der Schagt)
- Inoreader not marking items unread (#1109) (José Rui Barros)
- `content` attribute being unavailable to query feeds (#111) (Dennis van der
    Schagt)
- Newsboat sometimes opening wrong items (#72, #1126) (Dennis van der Schagt)
- Unread items being double-counted by `-x print-unread` and notifications
    (#444, #1120) (Alexander Batischev)
- Nested lists being strung out into a single, non-nested list (#1158) (Dennis
    van der Schagt)
- Colons sometimes making filter expressions invalid (Alexander Batischev)
- Child processes that display notifications not being waited on. We now
    double-fork them (glacambre)
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