Add a touch move binding
Add a touch move binding

When holding the compositor super key the touch events can now be used
to move a window.

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