plugins XEP-0300, XEP-0446, XEP-0447, XEP0448 and others: Refactoring to use Pydantic: Pydantic models are used more and more in Libervia, for the bridge API, and also to convert `domish.Element` to internal representation. Type hints have also been added in many places. rel 453

You'll find install instructions in documentation (see doc/installation.rst).

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