Release 2.4.0

What's Changed

• {Dataset, DataArray}.fillna by @ecomodeller in #789
• Support comma in pfs file names by @ecomodeller in #793
• Preserve dtype during interpolation by @ecomodeller in #796
• Support multiplication and division of datasets. by @ecomodeller in #792
• Remove xyz by @ecomodeller in #797
• Generic clean up by @ecomodeller in #722

Full Changelog: v2.3.0...v2.4.0