Distorted Android

Minor.

Convert the Ivy corner cubit to the new, 'universal' cubit creation method.

This forces deep changes to 'createRoundSolid' and the underlying 'MeshPolygon' class to make them support arbitrary Polygon 'centers of face convexity'.

Reason: the faces of this cubit are concave and such default 'center of face convexity' (which by default used to be (0,0)) turned to lie outside the face - which produces strange visual artifacts.

Copy constructors for the Statics.

Dynamics: minor.

Dynamics: consolidation of code.

Dynamics: introduce two speed modes - smooth and segment_constant.
Prepare the third mode - globally_constant.

2 Skewb Ultimate cubits.

RubikControl: fixes; progress.

Make Dynamic's resetToBegin() done on the next frame.
This is necessary if we want to reset many Dynamics at one go and have all of them start synchronized.
Otherwise it can happen that when we reset, we do it when some objects which the Dynamics belong to are already rendered and others are not, and then some of the Dynamics will be delayed by one frame which is visible already.

Progress with RubikControl - sub-stages 1 and 2 of the 'whole' stage finished.