Use tray_icon crate for better tray icon support (#288)

* Use `tray_icon` crate for better tray icon support

* Install atk in github actions

* Use different crate for Linux and platform generic tray icon struct

* Introduce abstract, platform generic tray icon

* Remove unnecessary GTK3 dependency from CI workflow

* Move tray icon implementations into submodules with no other changes

* Minor refactoring

* Refactor tray icon implementation to a simple spawn function

* Update `tray-icon` dependency

* Fix compilation dependencies on Linux

* Fix exit mapped to incorrect command in new tray icon implementation

* Fix icon rendering on Linux

* Handle left mouse click on the icon on Windows to show an app

* Make tray icon clicking toggle window visibility instead of just showing

* Rename second tray icon menu item to Quit

---------

Co-authored-by: Nazar Mokrynskyi <nazar@mokrynskyi.com>

.github/workflows/release.yml

@@ -45,7 +45,7 @@ jobs:
 
       - name: Install GTK4 and libfuse2 (Linux)
         # libfuse2 is needed for AppImage to run
-        run: sudo apt-get update && sudo apt-get install --no-install-recommends -y libgtk-4-dev libfuse2
+        run: sudo apt-get update && sudo apt-get install --no-install-recommends -y libgtk-4-dev libdbus-1-dev libfuse2
         if: runner.os == 'Linux'
 
       - name: Configure GTK4 cache (Windows)

.github/workflows/rust.yml

@@ -64,7 +64,7 @@ jobs:
         uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
 
       - name: Install GTK4 (Ubuntu)
-        run: sudo apt-get update && sudo apt-get install --no-install-recommends -y libgtk-4-dev
+        run: sudo apt-get update && sudo apt-get install --no-install-recommends -y libgtk-4-dev libdbus-1-dev
         if: runner.os == 'Linux'
 
       - name: Install GTK4 (macOS)
@@ -165,7 +165,7 @@ jobs:
         uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
 
       - name: Install GTK4 (Ubuntu)
-        run: sudo apt-get update && sudo apt-get install --no-install-recommends -y libgtk-4-dev
+        run: sudo apt-get update && sudo apt-get install --no-install-recommends -y libgtk-4-dev libdbus-1-dev
         if: runner.os == 'Linux'
 
       - name: Install GTK4 (macOS)