Magic Cube

Bugfixes for touch control - specifically for furious swiping and concurrect backing of moves.

Block the object, menu & back moves while we're scrambling!

Some improvements to blocking, mostly to the names of variables.

Block rotating layes of not free objects in the Tutorial Activity.

Very important bugfix for an issue which probably has been the reason for many mysterious behaviours in the past: the JsonReader class cannot be a singleton! Convert it into a normal 'instanced' class.
With it being a singleton there's a major issue: when we create a new TwistyObject from a JSON file (by, for example, going to PurchaseActivity) and then we come back to the old object (by, for example, going back to the main RubikActivity) - then the JsonReader inside the old object has read the new JSON file and thus many of the 'abstract' methods in the old TwistyObject (for example getShortName()) all of the sudden start returning new values!

IAP part 4: further progress with locks in the object popup screen.

IAP, part 3: non-free objects appear in the popup with a lock icon: make the lock icon's size resolution-independent

IAP, part 3: non-free objects appear in the popup with a lock icon.

IAP, part 2: unify the way we create object popups in ScreenPlay and ConfigActivity.

external,helpers: license.