GTK4

There are a few FIXMEs, grep for "FIXME GTK4".

External things:

• Gamepad view crashes - an rsvg bug, need to wait for a g-b-m update
• Search bar entry doesn't expand if clamp isn't expanded, it should propagate expand correctly - libadwaita bug, need to fix that
• Media button, layout switcher, n64 pak switcher - need an arrow, waiting for a GTK MR to get merged
• Selection checks aren't well visible on top of covers - libadwaita

Our bugs:

• Preferences window crashes if you close it and open again
• Cover emblem only renders with default color - need to refactor it to be a real widget but shouldn't be a blocker
• (org.gnome.GamesDevel:2): Gtk-CRITICAL **: 17:26:31.473: gtk_button_set_icon_name: assertion 'icon_name != NULL' failed
• Missing media button.active - can't track popovers in fullscreen, need to do it via focus
• Shortcuts don't work - need to redo them via the new API
• Wrong row is selected after snapshot rename
• I commented out a few action lookups in there, will probably have to replace that altogetherthere
• Snapshot row - wrapping date messes things up, replaced with ellipsize for now
• The first row is missing in the snapshots list - need to delete all but first row instead of just all. Or really rework it to use a model, but it will be a problem with animating rows