Magic Cube

Progress with Skewb familty; separate StickerFactory class.

Spearate the concept of number of layers of an object and its size.
In case of the Skewb family, this is no longer the same (Master Skewb has 3 layers but it's twice bigger than the 2-layered Skewb)

Objects must explicitly provide a list of offsets specifying where the cut planes are (rather than just a BASIC_STEP - the width of the layer - which is insufficient in case of objects which have layers of vastly different width, like the Master Skewb)

Move computation of the rotation rows to the Object from Cubits.

Beginnings of support for any-sized Skewb.

New meshes.

CubitFactory: unify creating MeshPolygon bands.

Play State: Recreate all 3 PopupWindows.

More debugging for the case of suspicious submits.

Swap Redi with Helicopter.