Support added for
- X11 XRandR 1.3
Note: Our whole MonitorMode association handling is currently _not_ dynamic.
- only on Windows we actually use native unique ID,
which might not change (adapter and monitor idx)
- On OSX and X11 we simply use indices,
but if monitor setup changes - they refer to different instances.
In case it is desired to cover dynamic monitor setup change,
we need to address this issue in a new bug entry.