Player window is considered mobile friendly with its transitions and touch/swipes gestures implemented. The only missing part now is preferences window that needs moving to libadwaita. Due to video playback being mobile friendly, mark this app as Purism Mobile compatible which will allow the app to appear on mobile app store and show the app icon in app launcher.
I were never able to get setifactionary results with this because:
* In GTK apps new window is created from the same process
* OpenGL is single-threaded so performance per window is halfed
* GTK4 has problems with rendeing using multiple contexts resulting in some frames being upside down
So for the time being I am removing a non-working option. There is a chance
that it will be fixed and added in future, but for now lets not
advertise a functionality that does not work.
