Add more mesh optimization algorithms

Currently, PR #154 adds support for an initial mesh optimization algorithm inspired by simulated annealing. However, this gradient-free method may not be ideal for all use cases.

So, we should add further mesh optimization procedures. There are many libraries that generate optimized .obj files we can import, so we should focus on algorithms that exploit our discrete differential geometry features. There are some known mesh optimization techniques that are relevant to the DEC, such as so-called "Hodge-optimized triangulations" (HOT) that are worth exploring, but currently do not appear to have an open source implementation.