Core/Misc: Use proper headers to optimize compile

src/server/game/AI/ScriptedAI/ScriptedCreature.cpp

@@ -5,9 +5,13 @@
  * This program is free software licensed under GPL version 2
  * Please see the included DOCS/LICENSE.TXT for more information */
 
-#include "ScriptPCH.h"
+#include "ScriptedCreature.h"
 #include "Item.h"
 #include "Spell.h"
+#include "GridNotifiers.h"
+#include "GridNotifiersImpl.h"
+#include "Cell.h"
+#include "CellImpl.h"
 #include "ObjectMgr.h"
 #include "TemporarySummon.h"