Remove debug messages

MaterialGraphProject/Assets/UnityShaderEditor/Editor/Drawing/Views/MaterialGraphView.cs

 
         public bool CanAcceptDrop(List<ISelectable> selection)
         {
-            Debug.Log("GraphView.CanAcceptDrop " + string.Join(", ", selection.Select(x => x.GetType().FullName).ToArray()));
-            Debug.Log("GraphView.DragUpdated");
-            Debug.Log("GraphView.DragPerform");
-            Debug.Log("GraphView.DragExited");
             return EventPropagation.Continue;
         }
     }