Because we added a network unit test

fix #3137

When set to true, the realname and username are extracted (by default) from
the user’s JID

fix #3136

ref #3136

Used in the USER command when connecting to the IRC server, instead of the
first nick.

fix #3028

This let any user choose which ports to use when connecting to the IRC
server. This also lets the user choose whether or not to force TLS usage (by
setting no non-TLS port).

fix #2731

fix #3068

Provides two options for now, and they have no effect yet

Uses litesql

Each IrcClient callback has a max and min size of argument, we call the
callback only if the parsed message has a correct number of arguments,
otherwise it is ignored (with a warning logged).

Also fix some constness things

Use map instead of unordered map (it's not slower, and it's shorter).
Use the default move constructor.

On my poor benchmark, it was infinitesimally faster.

Remove the close() method and closed attribute. Remove all the calls to
close().  (Save one bool per XmlNode, yay, and save a few ifs and some
useless function calls. At best it should be unnoticeably faster and lighter
and save a few keystrokes in the future)

The server will respond with the current channel mode, in private or
something

fix #3083

ref #3083