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* core
* allow providing values in mapchete configuration from environmental variables (e.g. `key: ${SOME_ENV_VAR}`) (511)
* enable setting individual storage options for `fsspec` and other I/O modules (`rasterio`, `fiona`, ...) for each input and output (511)
* introduce `mapchete.path` module including `MPath` class based on `os.PathLike` (511)
* use `MPath` for all internal path representations (511)
* introduce `mapchete.io.settings` module (511)
* allow range requests on serve (539)
* packaging
* run isort on imports (538)
* testing
* require and run `docker-compose` before tests to provide S3 and HTTP endpoints (511)
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