Py-qgis-server

* Configurable forwarded header list
- Configure whitelist of Header's prefix allowed
to be forwarded to Qgis api/services
* Add condition when preprocessing POST requests
* Handle `QGIS_PROJECT_FILE` environment variable
- Return 400 on invalid OWS service request (no Map)

* Fix wrong type for AMQP Logger variable `connection_delay`
* Pass `X-Qgis-*` headers
- Allow custom headers from https://github.com/qgis/QGIS/pull/41333

* Fix streamed GetFeature requests
- Refactor streamed response
- Allow empty chunk
* Logging: raise from debug to error if invalid layers are found
* Use docker-compose for running tests

* Enforce required python version in setup.py
* Fix supports for PUT/DELETE/PATCH/HEAD HTTP methods for qgis API

* Fix Qgis server api call in management
* Add specific option for logging qgis info message logs
* Print extended version information
* Use setup.cfg for flake8 options
* Handle 0 length response from qgis server
* Expose Qgis api to public interface:
* Expose landing page (https://github.com/3liz/py-qgis-server/issues/29)

* Release on https://pypi.org