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Add central blitframebuffer method in OpenGLState

Ken Martin requested to merge ken-martin/vtk:centralize_opengl_blitframebuffer into master

MacOS systems require the GL_SCISSOR_TEST be disabled for depth blits to work. The easiest way to enforce this is to have VTK code all call a central blit function. This also has the advantage of making debugging a bit easier as most blits will go through one code point.

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