Luftdatenpumpe

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- Fix acquisition of station list from EEA

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- Fix Python sandbox and test infrastructure
- Improve Nominatim reverse geocoding heuristics and corresponding tests
- Fix dependencies. Thanks, MauritsDescamps.
- LDI: Fix data acquisition
- LDI: Fix forwarding to MQTT
- OpenAQ: Fix acquisition for certain records without geo information
- Improve project tooling, add CI, linter, and code formatter
- Sanitize code and prose with linters

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- Don't use caching for live data. Thanks, Matthias.

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- Add missing ``openaq.py`` file

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- Add adapter for OpenAQ
- Slightly improve reverse geocoding
- Use improved "panodata-map-panel" instead of the original Worldmap
- Update documentation

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- Fix invalid JSON file export for stations list (17). Thanks, David.