Update visibility system

*visibility updates and ai relocations processed simultaneously for each grid
  *these operations now are not synchronized for different grids
  *some changes into structure of visibility notifiers

--HG--
branch : trunk

src/game/MiscHandler.cpp

@@ -1416,10 +1416,8 @@ void WorldSession::HandleFarSightOpcode( WorldPacket & recv_data )
             sLog.outDebug("Unhandled mode in CMSG_FAR_SIGHT: %u", apply);
             return;
     }
-    // Update visibility after vision change
-    //Cell cell(pair);
-    //GetPlayer()->GetMap()->UpdateObjectsVisibilityFor(_player, cell, pair);
-    GetPlayer()->SetToNotify();
+
+    GetPlayer()->UpdateVisibilityForPlayer();
 }
 
 void WorldSession::HandleSetTitleOpcode( WorldPacket & recv_data )