Introduce dedicated OpenGL1 and OpenGL2 compositing types
The CompositingType enum turns into flags and two new values are introduced: OpenGL1Compositing and OpenGL2Compositing. Those new values are or-ed to OpenGLCompositing so that a simple check for the flag OpenGLCompositing works in case of one of those two new values. To make the generic check for OpenGL compositing easier a method in EffectsHandler is introduced to just check for this. The scenes now return either OpenGL1Compositing or OpenGL2Compositing depending on which Scene implementation. None returns OpenGLCompositing.
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