wayland.selection: Introduce ext data control protocol #4828

Job	Run time
clippy-check	1m 17s
format	2m 18s
smithay-check-features	4m 50s
check-minimal	1m 24s
Documentation on Github Pages	1m 7s
anvil-check-features	2m 11s
check-msrv	1m 4s
smithay-tests	2m 45s
smallvil-check	53s
WLCS: Core tests	1m 11s
WLCS: Output tests	1m 21s
WLCS: Pointer input tests	1m 5s
WLCS: Bad Buffer Test	1m 15s
	22m 41s

Provide feedback