Ocelot

This is an interim development release that formally makes the package installable via Pip. In addition, it includes a number of breaking API changes. These API changes will **not** be listed in full until 0.4.0 (as pretty much everything is being rewritten).

In addition, the default branch was renamed from `master` to `main`. You can update your local version of ocelot to have the correct branch name with:


git branch -m master main
git fetch origin
git branch -u origin/main main
git remote set-head origin -a

Introduction (and extensive live testing of) features for cluster analysis and crosmatching.

ocelot.cluster:
- Various tools added for pre-processing datasets
- Also some preliminary (slow) tools for resampling Gaia astrometry with its covariance matrices
- Experimental tools for determining epsilon when using DBSCAN
- Experimental tools for generating synthetic clusters

ocelot.crossmatch:
- Tools for crossmatching catalogues (defined as ocelot.crossmatch.Catalogue objects) with detected OCs in Gaia data.

* A wide range of interpolation options were added, allowing isochrones and CMDs to be interpolated.
* A framework was implemented that could be built on to measure the scatter about a spline fit to a CMD, but over time this was deemed not worth the effort (and not very effective.) For the time being, the code will remain in the unit.
* Various QoL improvements and unit testing added for the ocelot.plot submodule.

v0.1-unstable
- Basic plotting functionality ported from the Jupyter notebook of experimentation.
- Minimal testing completed!
- This is being released early as I want to work on other things - ocelot.plot will have changes and more refactoring in the future.