* Fix the following issues:
1. HashMap non-thread-safe issus
2. Fix the same problem in pr621, but use a better implementation
Add the following functions:
1. There is now a language cache inside getLanguage to prepare for different languages corresponding to different time zones where the accounts in the server are located
* add /language command,each account has their own Locate
Additonal stuff: Fixed + refactored help command. Removed 'Usage: ' from all commands. Created 'player.hasPermission(permission)' function. Created default for Usage annotation. Created hashmap version of 'getHandlers' and renamed the original to getHandlersAsList()
