fix the 'holes in textures' problem.
speedups (correctly remove the internal walls of joined elements)
Major change in JSOn file format:
replace the old (corners,centers) system with a list of VertexEffects which are applied to each cubit variant.
helpers: license.
Mode the 'iconMode' from static variable in ObjectControl to member varaible in TwistyObject (safer)
Split ObjectShape into ObjectShape and ObjectFaceShape