SmartAI: Use same method for removing auras in EnterEvadeMode as in CreatureAI

Also fixes warnings about duplicate auras. Self-casted auras were not removed on entering evade mode in SAI as they are in CreatureAI.
Core/Misc: Defined a few fields in Map.dbc and rewritten InstanceMap::GetMaxPlayers to match what the client does to determine max players
 DB/Gameevent: Fix typo
Update 2014_03_30_02_world_game_event_335.sql