Update plasma_window_management protocol
We're currently still at version 10. Upstream Plasma Wayland Protocols is at version 15.
- 11:
event stacking_order_changed
- 12:
request get_window_by_uuid event stacking_order_uuid_changed
- 13:
event window_with_uuid
- 14:
request request_enter_activity (ignore) request request_leave_activity (ignore) event activity_entered (ignore) event activity_left (ignore)
- 15:
request send_to_output
This all looks rather trivial. We will stub out the additions of version 14 because of kwinft#120 (closed).