Fixing some VectorArena to use external arena and reduce the number of alloc.

Made the passing of name to arena more flexible

Game/Entity/EntityManager.cpp

@@ -14,7 +14,7 @@ namespace Game
     void InitEntityManager(Juliet::NonNullPtr<Juliet::Arena> arena)
     {
         Manager.Arena = arena.Get();
-        Manager.Entities.Create(arena);
+        Manager.Entities.Create(arena JULIET_DEBUG_PARAM("Entities"));
     }
 
     void ShutdownEntityManager()