progress with saving solves
Progress remembering ongoing solves.
Improve DialogUpdates
Up version to 2.3.0, AboutDialog.
Change the size of dialog's button strings to before showing the dialog, to avoid the flicker.
Bugfix: make it possible to download tutorials for an object later.
big change to SharedPreferences: make all the values in RubikScores save their preferences just-in-time, and not on the exit of the app.
SharedPreferences
more work on Preferences
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