* 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.