Simplifications
Move ObjectControl, the next big chunk of code, to objectlib.
Move PreRender to objectlib.This code is now shared betweeen the Rubik and Tutorial activities.
Move yet more code to objectlib.It's almost possible to move the PreRender to objectlib now.
Move yet more code to objectlib.
Move more code to objectlib.
Simplify TwistyObject's API.
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