Vivarium

- Reformat code with black and isort.
- Add formatting checks to CI.
- Add `current_time` to interactive context.
- Squash pandas FutureWarning for Series.append usage.
- Add a UserWarning when making a new artifact.

- Update CI to make a cleaner release workflow
- Add PR template

- Update license to BSD 3-clause
- Replace authors metadata with zenodo.json
- Updated examples
- Doctest bugfixes

- Add flag to SimulationContext.report to turn off results printing at sim end.

- Set Python version in CI deployment to 3.8

- Hotfix to re-trigger CI