TwistyPuzzleLib

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.

Changes to the initialization - initialize the 'bought objects'

switch off Masterball in the enum

minor

Masterball: correct scrambling (we must begin with a horizontal move)

Make it possible to create Diamond and Icosahedron-shaped objects to be read from json.

correct Masterball's icon.

Masterball: icon, mesh, jsons.