Use swiftsimio to read catalogues

[robjmcgibbon]

The pipeline currently relies on the velociraptor python package to read the SOAP catalogues. This PR removes this dependency, and instead switches to using swiftsimio to read the catalogues. This has the advantage of removing the need for maintaining the large translator file, which significantly simplifies the registration script.

A run of the pipeline using the current master branch is at https://home.strw.leidenuniv.nl/~mcgibbon/COLIBRE/update_pipeline/old_L25m7_z2/. A run using with these changes (using the same input SOAP catalogue) is at https://github.com/SWIFTSIM/velociraptor-python/blob/master/velociraptor/catalogue/translator.py The majority of plots are identical, but there are some with minor differences. These are due to slightly different binning, since velociraptor casts everything to doubles, but most properties in the soap catalogues are floats. I have verified that casting everything to doubles gives consistent results.

This relies on SWIFTSIM/pipeline#33. If we decide to keep the autoplotter functionality within VR, then this will need updated.

I have removed the colibre-zoom and eagle-xl config files since I don't think they will be used again. I have added a note to the README that they used to exist.

[robjmcgibbon]

@MatthieuSchaller @EvgeniiChaikin do you have any thoughts on this?

[MatthieuSchaller]

Yes, removing the intermediate package is good. I think this is a lot cleaner.

We should check with @JBorrow too. This whole set of tools and webpage construction is his original design for EAGLE-XL.

[robjmcgibbon]

I checked with Josh in SWIFTSIM/pipeline#33, and discussed with Evgenii in person, so merging now.