v2.0.0: Add new routes and use NWS API for metars.

- Fix metar functions.
- Add temp unit option to metar and conditions.
- Migrate to GitHub actions.
- Use F strings.
- New route, get stations for WFO.
- New route, get station info.
- New route, get WFO info.
- New route, get conditions (alias to decoded metar).
- Consolidate and update documentation.