Revenge of the Fallen - Trading, /tell, enchantment stuff, backend progress

In this small progress update, we finished writing the trading system, and we got some cross-server backend stuff working--/tell isn't a major feature, but it depended on this cross-server stuff being implemented before it could work. Since we're hoping to run an EU server and an NA server, being able to /tell players, regardless of which server they're on, is actually a decent milestone, since it also marks the completion of some other cross-server stuff. Enchantments obviously won't be done with a comm