Prepare the 'objectlib' package to be separated into a library module
Refactoring: split the 'objects' package into two, 'objects' and 'objectlib'.The point: we're going to need to move the 'objectlib' stuff into its own library module, and that's because we're going to create a new app module which needs access to it.
Fix the long-standing problem that putting app to the background would not stop the 'solving' counter.
Add a 'give up' dialog - if one made at least 10 moves when solving and presses a 'back' button, one needs to confirm.
Give visual indication when dragging is locked.
Abstract the part that controls the 'Locked' and 'Back Moves' buttons from the two activities: the main one and the tutorial one.This code had been duplicated there.
Cube Control: step 2.
Rename 'state' to 'screen'