plugin XEP-0384: update to latest python-omemo + better trust management: - python-omemo minimal version is now 0.11.0 - `undecided` devices are now handled, fixing the "accept all or none" issue: if a device is `undecided`, the trust manager will be shown with the missing devices before sending the message. - `untrusted` devices are discarded

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

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