Maps and polytopes to add

[Mixer2021]

* Other maps of type {4, 4}. (e.g. on a Klein bottle, on a cylinder, ...)
* Cubic toroids

[CunningGabe]

Cubic toroids are already in. For Klein bottle maps, see: "Uniform Maps on the Klein Bottle" by Steve Wilson.

[SupposeNot]

Cubic toroids are already in. For Klein bottle maps, see: "Uniform Maps on the Klein Bottle" by Steve Wilson.

This sounds interesting. Perhaps I'll tackle it with the bicontactual regular maps rewrite.