Improvements for the PopupWindows: now they work:
1) on Android 11, everywhere2) 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.
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