Port apps away from clutter / cogl

Clutter/cogl are being deprecated and will be removed from the GNOME SDK in GNOME 42

If you wish to replace the use of Clutter in your application, you should begin by porting to GTK4 and libadwaita; additional functionality, like an animation API, will be introduced in GNOME 42.

NOTE: This initiative focus on migration away from clutter, for general GTK4 migration check #26

Documentation:

• GTK3 to GTK4 migration docs: https://docs.gtk.org/gtk4/migrating-3to4.html

Apps:

• cheese cheese!55
• gnome-maps gnome-maps#353 (closed)
• totem totem#311 (closed)
• gnome-2048 gnome-2048#26
• gnome-nibbles gnome-nibbles#53 (closed)
• lightsoff Clutter dependency was dropped in 40.0
• quadrapassel quadrapassel#40
• retro-gtk
• swell-foop swell-foop#24
• gthumb gthumb#246