feature: Add persistent search settings (#257)

Adds persistent search settings across runs, by saving to the config file.  Each process widget keeps track of it's *own* behaviour.  The previous flags/options are now for *global* behaviour.

The following new behaviour is:
- Relevant flags: `--case_sensitive`, `--whole_word`, and `--regex`, will *override* the current widget's default behaviour.
- Relevant options: `case_sensitive`, `whole_word`, and `regex`, will also *override* the current widget's default behaviour.

As per before, if you set, say, `--case_sensitive`and `case_sensitive=true`, the flag always overrides.

Documentation updates will be done in #248.

1 files changed, 4 insertions, 3 deletions

diff --git a/src/constants.rs b/src/constants.rs
index 40f8e646..8bc6f11d 100644
--- a/src/constants.rs
+++ b/src/constants.rs
@@ -246,7 +246,8 @@ pub const DEFAULT_BATTERY_LAYOUT: &str = r##"
 pub const DEFAULT_CONFIG_FILE_PATH: &str = "bottom/bottom.toml";
 
 pub const CONFIG_TOP_HEAD: &str = r##"# This is bottom's config file.  Values in this config file will change when changed in the
-# interface.  You can also manually change these values.
+# interface.  You can also manually change these values.  Be aware that contents of this file will be overwritten if something is
+# changed in the application; you can disable writing via the --no_write flag or no_write config option.
 
 "##;
 
@@ -272,6 +273,6 @@ pub const CONFIG_LAYOUT_HEAD: &str = r##"
 # All layout components have a ratio value - if this is not set, then it defaults to 1. 
 "##;
 
-pub const CONFIG_DIVIDER: &str = r##"
-#########################################################################
+pub const CONFIG_FILTER_HEAD: &str = r##"
+# These options represent disabled entries for the temperature and disk widgets.
 "##;