frames: Handle touch events

frames: Handle touch events

This is just done on wayland as it'll break horribly on X11, we let
this happen through pointer emulated events in XISelectEvents evmask
instead.

Some things had to be made slightly more generic to accomodate touch
events. The MetaFrames shall lock onto a single touch at a time, we
don't allow crazy stuff like multi-window drag nor multi-edge resizes.

Bug: https://bugzilla.gnome.org/show_bug.cgi?id=770185
Origin: upstream, 3.28.3, commit:47131b1dadc1a9b7afe9a22740ab69ce97fb02d6

Gbp-Pq: Name frames-Handle-touch-events.patch