Magic Cube

1) add missing call to BlockController.onPause() / onResume() to the Tutorial activity
2) rearrange BlockController's error reporting to make the case where the MessageSender thread has died separate
3) in such case, resurrect the thread
4) simplify and harden the EffectMessageSender

Add Mirror 2x2 tutorials.

Mirror Cubes: make them still more off-center.

TwistyObject's ObejctScreenRatio and InitScreenRatio shouldn't be static. Make them non-static.
Otherwise, if the current object is, say, a cube (initSR=0.5), we fire up tutorials and start a tutorial for something with vastly different ObjectScreenRatio (Jing- initSR=1.64), then come back to the Main Activity - so there's a cube on the screen again - the ratios stay at their Jing values, which screws up detection of rotations.

New Jing and Master FTO tutorials.

Improve debugging in BlockController.

Lots of changes :)

When we're leaving the Tutorial activity, unblock everything.

Progress with RubikControl.

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.