Penrose 4x4.
Initial support fro Penrose 2x2.
switch off certain objects.
minor
new Penrose Cube.
Minor
Merge remote-tracking branch 'origin/master'
Initial support for Offset Cuboids.
Penrose Cube 3x3 mostly implemented. Remaining: detection of solved states.
Move signatures and ObjectConstants to Metadata.
Support Active and Inactive RubikObjects.
Next step toward separating TwistyObject metadata.