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The unit file Type=, as well as the executable path should now be correct
with a simple “make install”, whatever the install prefix and the DESTDIR
values are.

ref #3152

fix #3151

See http://ircv3.net/specs/extensions/multi-prefix-3.1.html
ref #3103

Include encodingIn and encodingOut options, unused at the moment

And a way to retrieve its values, defaulting on the ServerOptions for unset
values.

In Bridge and IrcClient

fix #3145

fix #3077

For the getaddrinfo call we added in the previous commit, to convert the IP
provided in the conf.

The error should not tell “while reading” when we are just connecting.

Lets the admin choose a local address to bind each outgoing (IRC) socket.

fix #2695

When trying the various results of getaddrinfo, we forgot to close the
socket when one fails, before trying the next one.

Also use the destructor to make sure we do not have some other unrelated
leak.