This backports a few fixes for Xwayland from master:
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4195e803 - xwayland: Clear private on device removal
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d35f6833 - xwayland: Fix crashes when there is no pointer
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6748a409 - xwayland: Initialise values in xwlVidModeGetGamma()
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ba0e789b - xwayland: Store xwl_tablet_pad in its own private key