Magic Cube

safety!

Improvements for the PopupWindows: now they work:

1) on Android 11, everywhere
2) on Android 10,9,8.1,8.0 - in case of fullscreen and split-screen modes; pop-up mode still does not work.
3) on Android <= 7.0 : there should be no pop-up mode, so they should be working in all cases

Defer initialization of statics in RubikNetwork till we actually need them.

Remove statics from the TwistyObject class.

Fix play screen popups in case the whole app is in 'multi-window' or 'pop-up window' state.

Simplify Play Screen popups.

Make the 'Play' popup always fit within the window height.

Remove statics from the Ultimate class.

Remove statics from the Square classes.

Remove statics from the Skewb class.

Remove statics from the Rex class.

Remove statics from the Redi class.

Remove statics from the Pyraminx class.

Remove statics from the Minx classes.

Remove statics from the Jing class.

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!)