Lots of bugfixes.
Move to AndroidX, target API level 29.
Minor tweaks to the 'Prev' buton in Solving state;Relax requirements in the Manifest - now only 'android.hardware.faketouch' supporting device is required, i.e. something that supports basic point-click-drag-unclick. No need for full 'android.hardware.touchscreen' thing with its multitouch silliness.
Each object size now has its own number of levels (not always 18!)
Reorganize UI of the Play state.
More support for the 3x3x3 Solver: more of the actual 3x3x3 solver mechanism.
Progress with Pretty Patterns - do away with the tabbed dialog!
Bugfixes.
Change the series of Object buttons in the Play state into a PopupWindow.
Implement a new Dialog, SetName.
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