purple-lurch 0.7.0 OMEMO Encryption for libpurple

Purple-lurch plugin adds end-to-end encryption support through the Double Ratchet (Axolotl) algorithm, to libpurple applications using XMPP, through its standard XEP-0384: OMEMO Encryption. It provides confidentiality, (weak) forward secrecy, break-in recovery, authentication, integrity, deniability, and asynchronicity.