Remove the final remnants of legacy 'ghost' stuff.
Carve out the fifth layer: touch control.
minor
Carve out the fourth layer: stickers.
Carve out the third layer from the Puzzle implementation: TwistyPuzzleSolved, i.e. detection of the solved state.
Next: the fourth layer: stickers.Then: fifth layer: touch control.Then: everything else. (metadata?)
API name changes; fix for Dino4's solved state!
Minor
remove numLayers from parameter list of 3 next methods.
correction.
remove numLayers from 4 API methods.
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