Uuid update

Made all changes necessary to update from a name based tracking system to the UUID tracking system. The database no longer tracks the manes of regular players, instead performing an account services lookup every time it is needed. Since this service could potentially be down, and the lookups are blocking, each command that needs a lookup is run in a separate thread using an ExecutorService. All functions that we're working before the update were verified to work with these updates. Modest improvements were implemented as well.