Spyral-utils

Some small changes to help usability:

- Add ParticleID, which is a combination of Cut2D and NuclearData to the nuclear module. Previously this was in Spyral, but it makes more sense to be here.
- Remove momentum module, and replace with a dependency on the vector package. They support way more advanced vector-analysis than what we could support, so make for a much improved solution over our custom one.

Documentation is updated and dependencies are somewhat cleaned up for the development side.

Fix the is_cols_inside function in Cut2D and add more robust testing to make sure this feature doesn't get broken in future updates

Fix a bug in cut is_cols_inside

We've removed the matplotlib dependency. This previously restricted downstream users to the matplotlib plotting system. Now the library is plotting backend agnostic; you can use which ever plotting system you like. The library includes explicit support for matplotlib and plotly, however this support does not limit you to those pacakges. Now use Shapely to calculate geometries.

Fix bug in momentum C.O.M transform calculation. Add documentation hosted via GitHub pages.

Fix a bug where Cut2D data was appended to a file rather than overwriting it.