Magic Cube

fix showing the number of stars on app startup.

Stars: introductory dialog explaining the concept of stars.

Stars Overlay: fix the 'negative numbers of new stars' mode.

Stars Overlay: implement zero and negative numbers of new stars.

Minor.

Minor.

correct the stars animation.
corect number of stars earned in level 8.

'Stars' animation: support totalStars up to 5 digits long, i.e. up to 99999.

Now the 'stars' animation should fulling work, even on the physical LG phone.

Stars animation: looks like if we do not switch off the depthMask and stencilMask of the OverlayNode, then the crash on my physical LG phone goes away.