New BussTUC plugin and several utils and fixes.

Add BussTUCPlugin with support for BusTUC by IDI. Add jSoup-based website-retriever. Add utils for general purpose use. Clean some junk. Fix settings file not being generated if not existing.
Because this can be reused. And yes, I realize this can be used for other events supporting getTarget and getSender as well, and we should add an Interface to irclib so these kind of things can be handled for all.