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This minor release primarily introduces the `Plugfigurable` class type, which is a very simple type that combines the existing `Pluggable` and `Configurable` types that are commonly utilized together.
Updates / New Features
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Interfaces
* Added a new `Plugfigurable` class that provides a convenient handle to inherit from both `Pluggable` and `Configurable` at the same time.
CI
* Updated gitlab CI rules to trigger the test jobs during merge requests, tag builds and branch pipelines when the branch in question is the default branch (i.e. master).
* Added python 3.9 to the gitlab matrix of versions tested. Added 3.9 to the ``setup.py`` metadata.
* Updated requirements versions to the latest for each package.
Fixes
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Docs
* Minor fixes to the ``sphinx_server.py`` helper tool: Removed a watch to a directory that does not exist.
Misc.
* Fixed ``MANIFEST.in`` file to not include a no-longer-present file and to include all ``requirements/*.txt`` files.
* Removed unnecessary ``.dockerignore`` file.