* clutter.symbols: Add new ClutterBehaviourScale setters.
* clutter/clutter-behaviour-scale.[ch]: Split the scaling factors
on both axis. Add setters for all the behaviour properties.
* clutter/clutter-effect.h:
* clutter/clutter-effect.c (clutter_effect_scale): Split the
final scale factor to match the ClutterBehaviourScale changes. (#709)
* tests/test-actors.c:
* tests/test-effects.c:
* tests/test-rotate.c:
* tests/test-scale.c: Update after API change.