XF86keysym: Add XF86XK_FullScreen

Merged Sebastian Wick requested to merge swick/xorgproto:keysym-fullscreen into master

Add XF86XK_FullScreen keysym, to be used as mapping for evdev's KEY_FULL_SCREEN.

Chromebooks have a special media key for toggling full screen mode.

Signed-off-by: Sebastian Wick sebastian@sebastianwick.net

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