Re-purposing KWaylandServer

[Vlad Zahorodnii]

Hi,

It looks like we've reached a conclusion. The most compelling option is 
to bring KWaylandServer under KWin's umbrella instead.

The current architecture doesn't work and it makes it harder to push the 
wayland progress forward.

I'll start the work on importing KWaylandServer after Plasma/5.22 is 
branched. OTOH, there seem to be no blockers for doing this during the 
5.23 development cycle. I will also write a more formal announcement 
about bringing kwaylandserver back to kwin later on.

Cheers,
Vlad