xwayland: Add (fake) device grab support

Add a new command line option "-host-grab" to disable the keyboard
shortcuts and confine the pointer on the host so that Xwayland can
receive all keyboard events.

This is useful when running a complete desktop environment within
Xwayland rootful.

Use [CTRL]+[SHIFT] to release the keyboard and pointer.

This option has no effect when running rootless.

Signed-off-by: Olivier Fourdan <ofourdan@redhat.com>
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