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.
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