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This actually makes the session_manager be useful, and saves a few octets of
memory for the other ones

For example, both JID #chan%server@biboumi/Toto and toto!server@biboumi are
equivalent, except that if you send a message to the first one, subsequent
messages coming from the user toto will come from that same JID. This is
done to be consistent for the XMPP user, and respond from the same JID than
the 'to' of the first message.

fix #2468

IRC users and channels are now distinguished by the separator used in the
IID (% or !).

ref #2468

ref #2521

ref #2521

fix #2541

fix #2539

For now, it tries two TLS ports and then connects to the non-tls port.  In
the future we would like the user to be able to configure that.

fix #2435

fix #2452

We have two basic example commands. But it’s not entirely finished because
there are some error checks that we don’t do.

ref #2521

fix #2469