upgrade to mapdb3

fixing it so that you can't login with ridiculous length usernames- build command fixed that allowed breaking out of jail

The first iteration of detainment code.  Includes persisted cooldowns as a major change.  Improvements to how we parse the command line for using items as well.

fixing a bug that blazecraft found, group kills were giving xp to other players based on the player who triggered killNpc

futher cleanup, had to revert back to the weird package name for Items because mapdb is throwing classdef not found