Magic Cube

Rename some assets for consistency

Make the Kilo and Megaminxes standard size (dodecahedron size=3,5, i.e. equal to numLayers so that DIST2D and DIST3D are standard)

Make the Ultimate standard size (dodecahedron size=2, i.e. equal to numLayers so that DIST2D and DIST3D are standard)

Make the Skewbs standard size (cube size=2,3, i.e. equal to numLayers so that DIST2D and DIST3D are standard)

Make Rex standard size (cube size=3, i.e. equal to numLayers so that DIST2D and DIST3D are standard)

Make Jing standard size (tetra size=2, i.e. equal to numLayers so that DIST2D and DIST3D are standard)

Make Ivy standard size (cube size=2, i.e. equal to numLayers so that DIST2D and DIST3D are standard)

Make Helicopter standard size (cube size=3, i.e. equal to numLayers so that DIST2D and DIST3D are standard)

Mirror Cubes: re-enable meshes; update meshes.

Mirror Cubes: make them a bit more off-center.