Added IRC Group specific ingame prefix and suffix

For example, you could have ops show as one color ingame, and half ops
show as another. Examples in messages.yml

IRCd.java has a large diff because I formatted it with Eclipse's default
format tool, as the strings were getting way too long to read easily
when I was adding the .replace() calls.
Merge pull request #33 from ron975/master

Prefixes and suffixes according to IRC Modes