Forum Fixups

I fixed the forums so that now instead of the threads being unsemantic tables they are ordered lists, styled a little different than they were before. This should mean faster load times for everyone. The thread lists and such I’m inclined to leave because it really is representing tabular information, just the thread itself wasn’t.

I also fixed up the character handling for the forum. It now allows a few tags (listed by the post box) and encodes everything else. This should make posting code and such much easier. Enjoy!