Implement the KWin part of the screencast protocol
See also
https://invent.kde.org/frameworks/kwayland/-/merge_requests/1 < deprecating internal id, add uuid kwayland-server!2 (merged) < introducing screencast, uuid
See also
https://invent.kde.org/frameworks/kwayland/-/merge_requests/1 < deprecating internal id, add uuid kwayland-server!2 (merged) < introducing screencast, uuid