[actor] Add :clip-to-allocation property
[actor] Add :clip-to-allocation property

A common use of setting clip is to keep an actor inside its allocation;
right now to do this you have to set up a callback on notify::allocation.

There's no overhead added by sticking another bit in ClutterActor
clip-to-allocation that will clip painting to the allocation if set.

Signed-off-by: Emmanuele Bassi <049ee2061f71220e5aaf33f5be422fc2a2b06a44@linux.intel.com>

collects/clutter,GNOME/clutter,djdeath/clutter-android,ebassi/clutter,rkudiyarov/clutter_osx,Distrotech/clutter,Distrotech/clutter,rkudiyarov/clutter_osx,kerrickstaley/clutter-vala,djdeath/clutter-android,rkudiyarov/clutter_osx,GNOME/clutter,GNOME/clutter,djdeath/clutter,ebassi/clutter,djdeath/clutter-android,djdeath/clutter,Distrotech/clutter,heysion/clutter-clone,djdeath/clutter,djdeath/clutter-multithreaded,jigpu/clutter,collects/clutter,tardyp/clutter,Distrotech/clutter,djdeath/clutter-multithreaded,tardyp/clutter,spatulasnout/clutter,rkudiyarov/clutter_osx,GNOME/clutter,heysion/clutter-clone,djdeath/clutter-android,GNOME/clutter,heysion/clutter-clone,spatulasnout/clutter,djdeath/clutter,djdeath/clutter,jigpu/clutter,Distrotech/clutter,kerrickstaley/clutter-vala,spatulasnout/clutter,spatulasnout/clutter,dlespiau/clutter,heysion/clutter-clone,ebassi/clutter,ebassi/clutter,djdeath/clutter-android,ebassi/clutter,kerrickstaley/clutter-vala,djdeath/clutter,nobled/clutter,Distrotech/clutter,jigpu/clutter,kerrickstaley/clutter-vala,collects/clutter,jigpu/clutter,tardyp/clutter,dlespiau/clutter,nobled/clutter,djdeath/clutter-multithreaded,djdeath/clutter-multithreaded,jigpu/clutter,jigpu/clutter,nobled/clutter,collects/clutter,spatulasnout/clutter,collects/clutter,heysion/clutter-clone,dlespiau/clutter