Magic Cube

Remove statics from the Ivy class.

Remove statics from the Helicopter class.

Remove statics from the Dino classes.

Remove statics from the Diamond classes.

Remove more statics from the Bandaged Cube classes.

Remove statics from the Cube classes.

Remove statics from the Bandaged Cube classes.

Fix the problem reported by Samsung -

1. Fire off the app
2. minimize it, select 'Multi window'
3. put some other app in the lower half of the screen
4. close the lower app
5. our app used to fail to display the upper and lower menu bars.

Convert Square-2 to the new generic scrambling algorithm.

In order to do it we need to introduce a third, artificial rotational axis - otherwise the algorithm would make it impossible to rotate the lower layer and immediatelly after - the upper.

Fix the Square-2 isSolved() (it was wrong even before!)