CCLayerRGBA is a subclass of CCLayer that implements the CCRGBAProtocol protocol using a solid color as the background.
All features from CCLayer are valid, plus the following new features that propagate into children that conform to the CCRGBAProtocol:
– opacity
– RGB colors
Warning: If the the texture has premultiplied alpha then, the R, G and B channels will be modified.
Values goes from 0 to 255, where 255 means fully opaque.