+ LongTime, ///< Serialize time as 64-bit values
+ RichMessages, ///< Real Name and Avatar URL in backlog
+ BacklogFilterType, ///< BacklogManager supports filtering backlog by MessageType
+#if QT_VERSION >= 0x050500
+ EcdsaCertfpKeys, ///< ECDSA keys for CertFP in identities
+#endif
+ LongMessageId, ///< 64-bit IDs for messages