Implemented Wallpaper Selector and Matugen's Wallpaper based auto-theming. (#73)

* Implement matugen - WIP

* Added matugen

* Add types and cleanup code

* Matugen implementation updates and added more options such as scheme and contrast.

* Code cleanup and matugen settings renamed for clarity.

* Makon maroon a primary matugen color.

* Updates to handle variations of matugen colors

* Finalizing matugen and wrapping up variations.

* Minor styling updates of the settings dialog.

* Do a swww dependency check.

* Dependency logic update

* Switch shouldn't double trigger notifications now when checking dependency.

* Logic was inverted

* Add matugen to dependency checker.

* Fixed dependency checking conditional

* Update dependency list in readme and check for matugen before doing matugen operations

* Styling fixes

* OSD Fix

* Remove unused code from wallpaper service.

* Color fixes for matugen.

* Nix updates for new dependencies

* Change default wallpaper to empty.

* Added custom notification service for startup, cleaned up code and updated readme.

default.nix

@@ -15,6 +15,8 @@
 , gpu-screen-recorder
 , networkmanager
 , brightnessctl
+, matugen
+, swww
 , python3
 }:
 let
@@ -58,6 +60,8 @@ in {
       export PATH=$PATH:${gpu-screen-recorder}/bin
       export PATH=$PATH:${networkmanager}/bin
       export PATH=$PATH:${brightnessctl}/bin
+      export PATH=$PATH:${matugen}/bin
+      export PATH=$PATH:${swww}/bin
       export PATH=$PATH:${pkgs.gnome.gnome-bluetooth}/bin
       export PATH=$PATH:${python3}/bin
       export GDK_BACKEND=wayland