edje: Add color class parent-child relationship with APIs

edje: Add color class parent-child relationship with APIs

It adds the following APIs
  void edje_object_color_class_parent_set(Evas_Object *obj, Evas_Object *parent)
  void edje_object_color_class_parent_unset(Evas_Object *obj)

If there is a color_class parent object, the color of object will be
follow parent object's color_class.
@tizen_feature

Change-Id: Ia89a26dab596a7dcfcf120dfffcc9787509292c2