Fix dragging especially by touch

The drag manager of a window now can take over from anything, so that
the events to initiate a drag are not stolen by the tap handlers
(fixes the drag starts only the second time is tried issue)

On wayland drag by touch was completely broken by the supportsclosewindows check,
now the touch drag handler is always active and the check of the property is done only
when the drag is over


(cherry picked from commit c1a536a5)
3 jobs for Plasma/5.25 in 16 minutes and 41 seconds (queued for 4 minutes and 48 seconds)