Magic Cube

Beginning of support for more than one solver per object.

Restructuring for the solvers in the app.

Progeress towards automatically integrating the Algorithmic solvers into the list of solvers in the App.

improve the way Crazy Puzzles are done: JSON files

Phased Solver app: debugging

minor

We no longer support Android 5.0 and 5.1 - min SDK upped to 23 (for reasons due to Google Play - they require this in order for the 'automated integrity protection')

Bump to version 2.1.1 ; About dialog.

System library issue.

UPgrade firebase BOM to the version which supports sessions.