Mapproxy

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Fixes:

- Fix capabilities links in demo page and config template
- Trivy report format

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Breaking:

- Add proper XML Exception when service parameter disabled / invalid or missing
In the past MapProxy returned WMS Capabilities when no explicit service parameter was given in
GetCapabilities requests. With this change, an OGC exception will be returned instead.
Invalid service types now also return a proper exception instead of an `internal error`.
Besides, the status code of exception responses now have a 400 or 500 code instead of 200
for better conformity.

Maintenance:

- Add test for seeding sqlite cache
- Documentation updates and clarifications
- Dependency updates

Fixes:

- Fix gh-pages workflow

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Improvements:

- Add timeout to SQLite connect for geopackages. This helps against locking exceptions
- Improvement of documentation, typos, wrong cli commands, old python2 stuff
- The WMTS capabilites will now advertise the WMS GetLegendGraphic as a LegendURL if both services are active
- It is possible now to configure LegendURLs that should be shown in the WMTS capabilities
- A new method for plugins to intercept and modify requests made to MapProxy was added.

Maintenance:

- Removal of debian package information
- Fix docs workflow

Fixes:

- Remove import of the packaging library that does not appear in the `install_requires`
- Only install and use `importlib_resources` in python 3.8

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Fixes:

- Fix version of jsonschema in setup.py
- Fix alpine docker build
- Fix doc generation workflow

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Improvements:

- Configuration files can no be splitted into multiple files
- Added jsonschema to validate configuration files
- New theme for documentation, overall improvement of the documentation and github workflow for automatic creation
- Improved docker images with better entrypoint and workflow to build docker images with a builder image
- Added release workflow for automatic publishing on pypi and github

Maintenance:

- Dependency updates
- Remove python 2 compatibility functions
- Added flake8 linting
- setup.py contains now required libraries
- Remove depracated `pkg_resources` in favor of `importlib_resources`
- Addressed shapely deprecations

Fixes:

- Ensure make_app always returns MapProxyApp instance
- Allow feature info responses of combined sources to be empty
- Fix broken TMS demo
- Fix problem with dimensions in load_tile_metadata
- Fix GeoTIFF Headers

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Fixes:

- Revert PR "Fix mixed image format for file, S3 and azureblob caches"