plugin XEP-0384: Implementation of Automatic Trust Management: - Implementation of Trust Messages (XEP-0434) - Implementation of Automatic Trust Management (XEP-0450) - Implementations directly as part of the OMEMO plugin, since omemo:2 is the only protocol supported by ATM at the moment - Trust system selection updated to allow choice between manual trust with ATM and BTBV - dev-requirements.txt updated to include additional requirements for the e2e tests fix 376