* mixxc: init at 0.2.2
* mixxc: update build inputs
Removed build inputs that were not used in the build process
Added build inputs for `wayland` and `X11` features
* mixxc: use `buildFeatures`, enable all features by default
* mixxc: use `wrapGAppsHook4`
Fixes icons not showing up properly
* mixxc: reformat using `nixfmt-rfc-style`