Better Wayland support

[mfourne]

Although vty already works, copy & paste under wayland requires an updated Hclip (jetho/Hclip#7) as well as updating/rewriting yi-frontend-pango to gtk3/4 to support full GUI under wayland.

[mfourne]

I started to slowly get on this, but I don't have a projected timeline to getting this finished, yet.

[mfourne]

A bit late into porting to use gtk3 I learned of gi-gtk, which seems to be better long-term and to which I have started porting.