Magic Cube

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.

Tutorials

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.

Fix the Solver

make numLayers into an int[] (preparation for Cuboids)
Caution: because of previous changes to cubit order in cube, the Solver is broken!

'IconMode' finished.

Remove unneeded API.

Relax objectlib's requirements: it can be displayed not only on top of a DistortedScreen, but any DistortedFramebuffer.

Simplification