TwistyPuzzleLib

Bugfixes.

Bugfix for reading JSONs version 6.

Minor bugfixes for creating JSON files version 6 (with per-cubit lists of VertexEffects)

corrections for rounding corners of bandaged cuboids.

corrections for rounding corners of kilo/megaminx.

Major change in JSOn file format:

replace the old (corners,centers) system with a list of VertexEffects which are applied to each cubit variant.

Make several objects built-in
oone fix for USE_IAP

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!

Purchase Pane: buttons

Win effects: first remove all effects, only then inform the Listener the whole Win sequence finished.