Extend the current "checkered" textures to add 2d checkered pattern support, variable sizes along each dimension (n^2, so "1" = 2, "2" = 4, "3" = 8), and support the variable sizes along all 3 dimensions for checkered cubemaps.

Update the TwoCubes.py example to use a 2x4x8 checkered pattern on an appropriately sized box.

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