touchcontrol: license.
Implement new TouchControlShapemod
FIx some issues with ShapeChanging; implement per-object TouchControlSquare and TouchControlMirror.
Implement example ShapreChanging object control and convert the Mirror Cube to use it.
Make the ShapeChanging the default TouchControl during MODE_REPLACE.
Float vertices - scratchbook
Abstract out the TouchControl stuff in preparation for its new type - TouchControlShapeChanging.