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Marcus D. Hanwell authored
This now gives us a vtkRenderingOpenGL2 that has most of the same classes as vtkRenderingOpenGL - the two will clobber each other's headers, symbols etc and so can never be built/linked at the same time. Unfortunately a lot of classes SafeDownCast or dynamic_cast to the derived OpenGL forms of the classes in vtkRenderingCore, and so using a different class name presented significant issues despite the fact that these classes are (in an ideal world) implementations of the API in vtkRenderingCore for OpenGL 2.1 and above. Change-Id: Ie8c6234621e550d3fd67da732d2cf4839290d665
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