System Tray (#743)

* Allow tokio on gtk thread

* Basic notifier host implementation

* Implement systray widget

* Use dbusmenu-gtk3

* Update flake.nix

* US spelling of license

* Fix possible TOCTOU

* Change how hosts are started

* Add watcher

* Bunch of refactor

* Handle errors better

* Refactor service parsing

* Avoid duplicate dbus connections

* Fix watcher producing bad items

* Handle zbus::Error::NameTaken

* Refactor icon loading & don't panic on zoom

* Implement pixbuf icons

Co-authored-by: Bojan Nemčić <bnemcic@gmail.com>

* Don't panic on icon/menu error

* Improve icon error handling to make discord work

* Update comments

* Big refactor into actor model

* Reword error messages

* Remove redundant watcher_on function

* Big icon handling refactor

* Don't unnecessarily wrap StatusNotifierItem

* cargo fmt

* Documentation

* Avoid registering to StatusNotifierWatcher multiple times

* None theme means default theme

* Add dbus logging

* Add libdbusmenu-gtk3 dependency to docs

* Some code tidying

* Make Item more clearer

* Make clippy happy

* Systray widget improvements

* Remove unwraps from dbus state

* Temporarily add libdbusmenu-gtk3 to flake buildInputs

* Fix blurry tray icon for HiDPI display

* feat: dynamic icons

* fix: don't cache IconPixmap property

this fixes dynamic icons for some icons, e.g. syncthingtray

* fixup! feat: dynamic icons

* Fix unused borrow warning

* Add some documentation to notifier_host

* Rename notifier_host::dbus to more descriptive notifier_host::proxy

* fixup! Rename notifier_host::dbus to more descriptive notifier_host::proxy

* fixup! Merge remote-tracking branch 'upstream/master' into tray-3

* fixup! Merge remote-tracking branch 'upstream/master' into tray-3

* Remove commented out fields of DBusSession

* Refactor host

* Remove git conflict marker

* Various improvements

* Icon documentation

* cargo fmt

* Add dependency to CI

---------

Co-authored-by: Bojan Nemčić <bnemcic@gmail.com>
Co-authored-by: MoetaYuko <loli@yuko.moe>
Co-authored-by: hylo <hylo@posteo.de>

Cargo.toml

@@ -7,6 +7,7 @@ resolver = "2"
 simplexpr = { version = "0.1.0", path = "crates/simplexpr" }
 eww_shared_util = { version = "0.1.0", path = "crates/eww_shared_util" }
 yuck = { version = "0.1.0", path = "crates/yuck", default-features = false}
+notifier_host = { version = "0.1.0", path = "crates/notifier_host" }
 
 anyhow = "1.0.79"
 bincode = "1.3.3"