Modify ColorMode Policy for SceneView and Model

Modify ColorMode Policy for SceneView and Model

 - For Model, Use ColorMode::USE_OWN_MULTIPLY_PARENT_ALPHA for ColorMode
 - Actor::Property::COLOR will affect its children Actors.
 - For SceneView, Use ColorMode::USE_OWN_COLOR when mUseFrameBuffer is true.
 - When Opacity of SceneView is animated, it looks natural.
 - But, use ColorMode::USE_OWN_MULTIPLY_PARENT_ALPHA when mUseFrameBuffer is false.
 - Then, Opacity animation is works (but slightly looks unnatural.)

Change-Id: Iaa993f5857f5bd9e2cf3b79b463f2fc5e5db3249
Signed-off-by: seungho baek <sbsh.baek@samsung.com>