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.
Well, not all triggers require the line to have additional content, you should make Javadoc to reflect how this method works. Perhaps even make one that only validates the trigger?