Downloaded Objects: bugfixes
Downloaded Objects more or less work now.
Refactor RubikObject in preparation for creating RubikObjects from DownloadedObjects.
Beginnings of support for dynamically adding downloaded JSONs to the local RubikObjectList: SharedPrefs part.
Support for saving the downloaded JSONs in local data storage.
Progress downloading objects and extras.
Re-organize tutorial list so that we can pull this one from JSON files.
Remove 3 out of 4 object icons.
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