compositor: use Mod-Tab to show/raise minimized surfaces
compositor: use Mod-Tab to show/raise minimized surfaces

Temporarily show minimized surfaces when switching between
surfaces with the keyboard. If the final selected one was
minimized, it will be restored.

Signed-off-by: Manuel Bachmann <d58f3f53462d5b02b85dbad407eeedd70c66c30c@open.eurogiciel.org>

sir-murray/weston,sir-murray/weston,kwm81/weston,giucam/weston,eyolfson/weston,Tarnyko/weston-xdg_surface_present,kwm81/weston,Fantu/compositor-spice,Gnurou/weston,udoprog/weston,Fantu/compositor-spice,mchalupa/weston,xorgy/weston,jonnylamb/weston,krezovic/weston,Fantu/compositor-spice,xorgy/weston,udoprog/weston,jonnylamb/weston,Tarnyko/weston-xdg_surface_present,krezovic/weston,eyolfson/weston,giucam/weston,Gnurou/weston,mchalupa/weston