The limit for the whole message is 512 bytes, we limit the body to 400
(instead of doing a calculation based on the command name and the other
parameters), because it's simple, easy and that’s enough.

fixes #2416

But some servers (epiknet for example) send channel names with an uppercase

It was recently removed because it was handled in the old "convert irc
colors" code. It now is in the right place.

The generated XML is very verbose because each IRC formatting tag makes us
close a <span/> element and reopen it with the new style applied.  However,
this works quite well and is easy to implement.

Also we cannot use both this feature and valgrind at the same time.
So, I’ll just specify this flag myself when I need it, this doesn’t
need to be there by default

Use ccmake, or cmake -i, or cmake -DPOLLER=EPOLL, for example

We append each line to a string, and when the MOTD is
complete, we send that string at once.

That’s ugly, and we need to sanitize everything properly, and also handle
these special messages.

Because the XMPP component connection is only available locally, the XMPP
servers proably only listen on 127.0.0.1 instead of 0.0.0.0.