Magic Cube

Refactoring: split the 'objects' package into two, 'objects' and 'objectlib'.
The point: we're going to need to move the 'objectlib' stuff into its own library module, and that's because we're going to create a new app module which needs access to it.

1) add missing call to BlockController.onPause() / onResume() to the Tutorial activity
2) rearrange BlockController's error reporting to make the case where the MessageSender thread has died separate
3) in such case, resurrect the thread
4) simplify and harden the EffectMessageSender

Some more debugs for the case when the UI is blocked.

Remove statics from the Cube classes.

Convert the Redi to the new scrambling paradigm.

Introduce pseudorandom balancing into scrambling in case of the two Dinos (from now on, the more times a particular (ax,layer) combination has been chosen already in the scrambling sequence, the less likely it is to be chosen next).
Fix Dino6 - isSolved(). Sadly, it cannot be the geeneric function - it needs to be another special case.

Preparation for unification of scrambling. Scrambling of all objects will be done by a generic funtion, only fed a certain data structure by the objects. The data structure is going to be the ScrambleStateGraph - a directed state graph of all states we can come across while scrambling....

Important step towards making the implementation of an individual puzzle code-free (i.e. data-only): move the 'MeshBase[] mMeshes' variable from the individual classes to the parent TwistyObject.

Introduce ObjectShape - a class encapsulating a shape of a Cubit.
Make the Megaminx cubit creation a bit more standard.

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.