箭头分离到独立的model中，方便自定义path

AIStudio.Wpf.DiagramDesigner/ViewModels/AdditionViewModel/Interface/ILockObjectViewModel.cs

@@ -0,0 +1,14 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Text;
+
+namespace AIStudio.Wpf.DiagramDesigner
+{
+    public interface ILockObjectViewModel
+    {
+        List<LockObject> LockObject { get; set; }
+        void SetValue(LockObject obj);
+        event PropertyChangedEventHandler PropertyChanged;
+    }
+}