This implements window attention requests via the xdg-activation-v1
protocol.
This was updated by @ elmindreda to work with recent Wayland related
changes to the main branch:
- Switched to current way of handling Wayland protocol files
- Added the xdg-activation-v1.xml protocol file to deps/wayland
- Added missing macros to rename protocol interface globals
The protocol file was copied from wayland-protocols 1.33.
Closes#2287
