Added a !fastbalance command to balance more than 6 players at a time
Extracted racer cache management out to a separate class.

Now support persistent racer cache between restarts and automatic refreshes after 24 hours
Added a clear command to remove all entries from the cache
Added help information for rank and fastbalance
Added a counter for number of loaded races and a conditional update to the racer model
Implemented bot-side update code to automatically update outdated racers instead of reloading them
Fixed NickServ detection to be a bit looser
Incremented version number to reflect major internals revamp
Moved data files to data subdirectory
Revamped the balance logic to use pattern files

Moved team calculation commands to a separate file