plugin XEP-0384, install: adapted plugin to omemo module changes + added omemo module to dependencies: - omemo module logs are now integrated in SàT - OmemoStorage adapated to changes - now really delete OTPK each time, behaviour may be modified in future - fixed bad arguments used during decryption - adapted to other changes OMEMO is now working \o/ It still needs some adjustements though: bundles/devices are for the moment requested on each message encryption, and fingerprints management is not implemented yet.