Magic Cube

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

Minor.

Minor.

Minor

Changes to the initialization - initialize the 'bought objects'

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.

Stars animation: support spending stars.