Magic Cube

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

Finally fix the 'impossible records' bug!

Thanks for a bug report from Jacob Powell - if one, during scrambling, minimized the app and re-entered it, the UI lock got removed (by a call to 'unblockEverything' from RubikActivity's onResume) and one could then keep solving the object mid-scramble....

More fixes for UI in case of extreme screen (w/h) ratios ( from 1.0 to 2.0 ).

Move the control of object scaling out the objectlib.
Thee xact way the object is scaled needs to be decided in the app, as only the app knows that e.g. in the Rubik main screen, if it is a square, then obejct needs to be a bit smaller than in case of Config screen (if that one happens to be a square)

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: finish the 'Purschase' activity.

IAP part 5: new 'Purchase' activity (cont'd)

IAP part 5: new 'Purchase' activity.

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