Mapproxy

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Improvements:

- Added docs regarding OGC API support

Fixes:

- WMTS Demo now works if kvp is disabled

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Breaking:
- Removed legacy seed configuration.
- Removed Python 3.8 support.
- Removed riak support as the client library is not maintained anymore. If you rely on the riak support you have to
continue to use version 3.1.3 with Python 3.8.

Improvements:

- The tile removal and refresh code is improved by simplifying the usage of `remove_timestamp` and `before_timestamp`
and complementing them by new `remove_all` and `refresh_all` parameters.
- Add a default logging config to the docker images.
- Add environment variables to the docker images to enable and configure multiapp support.
- Added a docker compose file to make it easy to run & build docker images and to use as reference.
- Updated and improved the documentation about usage of the docker images.

Maintenance:

- Use python build instead of invoking setup.py.
- Removal of the six library.
- Removed array initializers in function signatures.

Fixes:

- Added `AdminstrativeArea` to WMTS serviceprovider metadata.
- Fixed spelling & grammar in seed.rst.
- Fixed problem with combined usage of `coverage` and the `remove_all` cache config parameters.
- Fixed missing dimension parameters in the `remove_tile` functions of various caches.

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Maintenance:

- Several dependencies for the tests and GitHub actions have been updated
- Spelling and grammar mistakes in the documentation corrected

Fixes:

- The chmod to update file permissions is now only called if the file was freshly created
- A bug with clipping polygons that become multi polygons due to the clipping is now fixed

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Maintenance:

- Several dependencies for the tests and github actions have been updated

Fixes:

- Metadata URLs are now required to have a `url`, `type` and `format`
- The layers of a wms `req` are now correctly splitted at `,` for validation
- The validation for seeding configs is fixed
- Single color tiles are now created with configured file_permissions

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Maintenance:

- Werkzeug version is no longer pinned and can be chosen freely.

Fixes:

- The permission handling for file locks now also sets permissions on the files not just on the directories.

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Improvements:

- Add new config parameters `file_permissions` and `directory_permissions` to set file and directory
permissions on newly created cache files and directories.

Maintenance:

- Dependency updates

Fixes:

- Fix transparency in TMS demo page.