TwistyPuzzleLib

We need to support reading from earlier JSONs. Support v. 6 (partially - only the objects which do not have the new in v. 7 algorithms & edges - i.e. locally created bandaged cuboids)

Bugfixes

Produce new JSONs files (version 7, with new scrambling method)

Move scrambling to a new model where there are spearete scrambling 'algorithms' and 'edges' of the scrambling graph.
Now each edge can contain a whole algorithm, i.e. a sequence of moves leading from state to state, which permits construction of scrambling for more complicated bandaged objects such as the AI cube....

Fix touch-replacing colors of the stickers. Now correctly takes into account the shape of the sticker.

Bugfixes.

Bugfix for reading JSONs version 6.

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

Major change in JSOn file format:

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

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!