Skelethorn polyhedra

New pointed polyhedron styles, showing a snub cube and a rhombic triacontahedron. These were inspired by the recent Sphairahedron demos; triangles with round holes didn't look as good as larger polygons due to more material left near corners, so I wanted to replicate the overall feel with constant-thickness edge curves.

This turned out a surprisingly prickly problem, and I spent quite a while thinking about various approaches. As a side effect, I got those interesting mistakes I posted a while ago. It was a bit of a thorn in the flesh, but I soon got the tubes to go where I wanted, and I then spiked them up with more curves and an edgy cross-section for the final look.

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