Remove unneeded API.
Relax objectlib's requirements: it can be displayed not only on top of a DistortedScreen, but any DistortedFramebuffer.
Simplification
Use the off-center objects to display the object in Tutorial mode properly.Now it is not covered by the right bar!
Remove the 'setupObject()' redundant API.
Minor
Further simplifications.
Remove the concept of a 'TwistyActivity' altogether.
Hide most of the TwistyActivity methods inside objectlib.
Bugfix: we shouldn't be calling TwsityObject.solve() directly from the app, only through ObjectControl.solveOnly().
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