plugin XEP-0131: Stanza Headers and Internet Metadata implementation: - SHIM is now supported and put in `msg_data["extra"]["headers"]`. - `Keywords` are converted from and to list of string in `msg_data["extra"]["keywords"]` field (if present in headers on message sending, values are merged). - Python minimal version upgraded to 3.11 due to use of `StrEnum`. rel 451

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

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