Core: Add new system for parallelizing client packet processing. Handle WorldSession updates in Map::Update() where we are safe to proceed. Patch by Ambal.

(And clean up tabs and whitespace while rummaging around in there)
Closes issue 5084.

--HG--
branch : trunk

src/server/game/Entities/GameObject/GameObject.cpp

@@ -832,7 +832,7 @@ bool GameObject::isAlwaysVisibleFor(WorldObject const* seer) const
 
     if (IsTransport())
         return true;
-    
+
     return false;
 }