My X-Mas present to you: partially working encodings! \o/

My X-Mas present to you: partially working encodings! \o/
Actually, most of the basic infrastructure is in place; but we can't configure it yet,
i.e. ISO-8859-15 it is for now, and encodings are not respected when we send stuff yet.
It instantly gives you a working utf8 detection on receiving though, so those crappy umlauts
should be a thing of the past now.

The infrastructure allows for setting individual encodings for networks, channels and even
IRC users (for queries), so putting a decent UI on that thing should make Quassel really useful
in international environments that are too backward to use utf8 yet :)

BTW, hacking on Christmas Eve proves to be really productive...