Lots of changes :)
Bugfix
When we're leaving the Tutorial activity, unblock everything.
Make it impossible to launch more than one Tutorial screen at a time.
Progress with RubikControl.
BlockController: Unblock after 3 seconds.
Fix the long-standing problem that putting app to the background would not stop the 'solving' counter.
Fix the reddening the Lock icon.
Fix a rare crash.
Introduce a BlockController - a watchdog which makes sure the Touch and UI blocks do not take too long.If it detecs a long block, it unblocks and reports the situation to Crashylytics.
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