We no longer need to support 'edgesUp' in MeshPolygons.
Minor.
Fixes for creation of puzzles which include cubits with 'multigon' faces.
correct scrambling of the Coin Tetrahedron
correct the Coin Hexahedron (2).
correct the Coin Hexahedron.
correct face shapes (post-new MeshPolygon normal computation)
support Multigon in JSONs
use MeshMultigon in puzzle cubits (FactoryCubit)
MeshMultigon finished.
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