Improvements to FilterUtil

[drewdorris]

https://github.com/Ruinscraft/ruinscraft-chat/blob/rewrite4/src/main/java/com/ruinscraft/chat/util/FilterUtil.java

• Does not filter bad words that have an extra character added to the beginning/end of them (besides when a single character besides A and I is in the message)
• Does not filter words when an additional character or duplicate characters are added in between

Maybe we could try something public like https://gist.github.com/PimDeWitte/c04cc17bc5fa9d7e3aee6670d4105941

[ds58]

Also https://gist.github.com/Jire/4aa72bd3554cdccdc369c216a230ee56 (in the comments of that gist)

[drewdorris]

The one you posted uses a weird library, I'm going to integrate the first one