[Azoth] Refactored GetMUCJoinWidget() to the new IMUCProtocol.
[Util] Thinner FindNotification.
[Azoth] Added IMUCProtocol::TryGuessMUCIdentifyingData() for #1662.
[Azoth Xoox] Implement TryGuessMUCIdentifyingData() for #1662.
[Azoth MuC] Added /join command, closes #1662.
[Azoth Xoox] Fixed typo in translations.
[Azoth Xoox] Support storing password in identifying data.
[Azoth Xoox] Guess password in TryGuessMUCIdentifyingData.
[Azoth Xoox] Exposed password in UI.