Most of our "traditional" examples showed checkered cubes in a confined 3d space, typically one solid color and black, as shown below:

Add a named constructor to Cubemap which accepts a pattern name and an array of soy.atoms.Color. For the "checkered" pattern, each face will be a 2x2 texture. If the array is length 0 white/black will be used, if the array is length 1 the provided color and black will be used, length 2 both provided colors will be used. Each of these textures should have 1 shade (not smooth).

In the future additional colors provided beyond 2 may result in sides larger than 2x2, though that will not be a separate GCI task so for now any additional colors should be ignored.

Update TwoCubes.py to use this.

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When you've done, commit your work and post the resulting changeset url to this task.