* clutter/clutter-actor.h:
	* clutter/clutter-actor.c:
	
	(clutter_actor_class_init), (clutter_actor_set_property),
	(clutter_actor_get_property): Add the "clip" and "has-clip"
	properties.

	(clutter_actor_set_clip), (clutter_actor_remove_clip): Emit
	the notification for the changed properties.

	(clutter_actor_has_clip): Simple accessor to the "has-clip"
	property.