Crappy servers may assign invalid JIDs for user addresses

src/irc/irc_client.cpp:143:  IRC RECEIVING: IrcMessage[366]{linkmauve}{#shrinemaiden}{End of /NAMES list.}(from: cirno.ppirc.net) 
src/xmpp/xmpp_component.cpp:84:      XMPP SENDING:

The JID should not contain the : char. Maybe juste replace it with _ or something.

(from redmine: created on 2014-10-11, closed on 2015-05-13)

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