Speed up shaders (both compilation and execution) by explicitly enabling only the needed effects.
Preparation for shader optimization
Fixes for z-fighting.
Bug fix in RenderState.
Make it possible to render each DistortedNode with adjustable OpeGL state (writeing to Color, Depth,Stencil buffers, DEPTH, STENCIL, BLENDING on.off, etc)
New 'RenderState' class which will be used to change OpenGL state when rendering Nodes.
The only operation which is now enabled 'statically' in render() is blending.
1) stop culling back face2) reset OpenGL state beore each render (and not in onCreate)3) Improve Matrix3D so that we can test negative Scales
Exclude still more methods from public documentation.
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