Multiplicity and perform_pop_syn updates

[nsabrams]

In perform pop syn:

• Dynamic cluster generation
• Parallelization
• System Mass - now the system mass is the current mass instead of a mix of initial and current masses (SPISEA companions had been initial mass)
• System luminosity - now the magnitudes are system magnitudes instead of primary magnitudes for stars and system magnitude for compact objects
• Mass ratio - now the zams mass ratio (companion zams mass/primary zams mass) is capped at 1 This was implemented with an algorithmic change to perform_pop_syn. In addition to re-probing the KDTree when there are duplicates, we also reprobe the tree when the SPISEA star is more than 20% larger than the galaxia star is being matched with. After a number of iterations, those that can't be matched are dropped, which is only a few.
• Skips clusters < 80 Msun instead of < 100 Msun
• Added option to not bin hdf5 file (intended for very small patches or nearby objects)
• Increased minimum mass of star generated to 0.11 Msun to accommodate isochrones

In refine_events:

• Added support for legacy files with lowercase filter names
• Changed phi convention in binaries to match BAGLE
• Added seed support

In refine_binary events:

• Parallelized
• Simulate lightcurves for BSBL and BSPL events
• Point to BAGLE models with primary center, as PopSyCLE gives it
• Store all lightcurves generated in lightcurves.fits file
• Changed script to still find parameters if delta m < 0.1
• Fixed l, b mix up

Tests:

• Implemented pytest
• Overhauled test suite

Utils:

• Added util to remove nan companions (low mass objects in old populations with high metallicity)

Misc:

• Updated to be compatible with python 3.11