Magic Cube

Correction

1. Do not restore object scrambling if we freshly upgraded from some version older than 1.9.0
2. Bugfix for a recently introduced crasher in the Play screen.

Create the 3 Popups only on first button click - this time we can have the final screen dimensions (and also it starts faster ) Before we weree getting the screen size from before hiding navigation bars, which made the height smaller, which made the number of obejcts and levels in the popups sometimes too small!

Progress with cuboids.

'IconMode' finished.

Simplification

Remove the 'setupObject()' redundant API.

Remove the concept of a 'TwistyActivity' altogether.

Hide most of the TwistyActivity methods inside objectlib.

Bugfix: we shouldn't be calling TwsityObject.solve() directly from the app, only through ObjectControl.solveOnly().