Unparsed BBCode Lower Case
Noparsing Upper Case BB-Code converts to Lower Case.
This is actually a strange vBulletin Bug that results in BB-Code like [B] being changed to [b] if the tag isn't broken by some other character (the [/noparse] tag, perhaps?)
Even though this is a bug in vBulletin's parser, we may as well go ahead and fix it in the Wiki Code Parser.