Version 3.6.0: Add Galileo and BeiDou time scales

• Galileo System Time and BeiDou Time are now supported, huge thanks to @gwbres for all that work!
• Significant speed improvement in the initialization of Epochs from their Gregorian representation, thanks @conradludgate for #160.
• Epoch and Duration now have a min and max function which respectively returns a copy of the epoch/duration that is the smallest or the largest between self and other, cf. #164.
• [Python] Duration and Epochs now support the operators >, >=, <, <=, ==, and !=. Epoch now supports init_from_gregorian with a time scape, like in Rust. Epochs can also be subtracted from one another using the timedelta function, cf. #162.
• TimeSeries can now be formatted in different time scales, cf. #163

What's Changed

• optimise gregorian by @conradludgate in #160
• Remove redundant tests by @SUPERCILEX in #161
• Usability enhancements, especially for Python by @ChristopherRabotin in #165
• introducing GNSS timescales by @gwbres in #166

New Contributors

• @conradludgate made their first contribution in #160
• @SUPERCILEX made their first contribution in #161
• @gwbres made their first contribution in #166

Full Changelog: 3.5.0...3.6.0