Core: Update Player Limit and Player Security Level variables

- Allowed Security Level will be set at server load or with 'server plimit reset' command (before it was read each time someone tried to join)
- If Security Level is updated to a more restrictive value all people under that level will be autokicked

--HG--
branch : trunk

src/server/game/Server/WorldSocket.cpp

@@ -930,7 +930,6 @@ int WorldSocket::HandleAuthSession (WorldPacket& recvPacket)
     }
 
     // Check locked state for server
-    sWorld.UpdateAllowedSecurity();
     AccountTypes allowedAccountType = sWorld.GetPlayerSecurityLimit();
     sLog.outDebug("Allowed Level: %u Player Level %u", allowedAccountType, AccountTypes(security));
     if (allowedAccountType > SEC_PLAYER && AccountTypes(security) < allowedAccountType)