Get rid of Trinity Singleton and Threading patterns and replace them with ACE_Singletons and ACE_GUARD_x macro´s with ACE_Thread_Mutex´es respectively.

Also get rid of unused CountedReference class that used Trinity threading pattern.

--HG--
branch : trunk

src/server/game/Entities/Pet/Pet.cpp

@@ -74,7 +74,7 @@ void Pet::AddToWorld()
     if (!IsInWorld())
     {
         ///- Register the pet for guid lookup
-        ObjectAccessor::Instance().AddObject(this);
+        sObjectAccessor.AddObject(this);
         Unit::AddToWorld();
         AIM_Initialize();
     }
@@ -98,7 +98,7 @@ void Pet::RemoveFromWorld()
     {
         ///- Don't call the function for Creature, normal mobs + totems go in a different storage
         Unit::RemoveFromWorld();
-        ObjectAccessor::Instance().RemoveObject(this);
+        sObjectAccessor.RemoveObject(this);
     }
 }