Handle conversion errors properly by inserting � instead. Add a binary
header to provide portable way to write binary literals (I like them) Also
add a test file. ref #2404
Add all useful classes as well: Jid, Iid, IrcChannel, IrcUser etc to
properly keep the informations about what we receive from the IRC server.
Only handle the MUC join stanza, and send the list of users in the IRC
channel to the XMPP user, and the IRC channel’s topic, for now.