[#84]Export Speed Up

Exporting a character with 15k polys now takes 5-10 seconds as opposed
to 10-20 minutes.
These two `if` are different only with `noKey = utils.veckey3d21(face.normal)` and `noKey = utils.veckey3d21(vertex.normal)` so please extract common code and please in `if` only that one is different.