Major upgrade includes numerous new features from v1.2:
- Support scripts vspace, mulit-planet, and bigplanet have been moved to their own repositories
- The default (release) branch has been renamed to 'main'
- New testing procedures are more informative and use GitHub Actions
- C style is now enforced via a precommit hook
- Upgraded documentation, including tutorials on how to modify the code
- VPLanet is now installable and upgradable via pip and can be easily run inside a Python script