[s2089] Correct GM and improve npc chat command.
[s2090] Cleanup world state sending

As we understand most of the world states now there really is no need to send dummy states if the zones/battlegrounds are not implemented/enabled

See https://github.com/cmangos/issues/wiki/World-States for a list of known world states

(based on commit [12600] - 59d1aa5)
Merge https://github.com/cmangos/mangos-tbc