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.
Even so, having the original author is a nice touch, as it allows you to contact the person that wrote the code. I appreciate that this is possible through git blame, but we have always tagged the code with @author (until now).