重写了节点的view、viewmodel关系，实现了对画布元素的选取功能，重构了底层依赖，添加了对net .Framework4.6.1以上的Framework类库支持

WorkBench/Node/ViewModel/ConditionRegionNodeControlViewModel.cs

@@ -0,0 +1,18 @@
+using Serein.NodeFlow.Model;
+using Serein.WorkBench.Node.View;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Serein.WorkBench.Node.ViewModel
+{
+    public class ConditionRegionNodeControlViewModel : NodeControlViewModelBase
+    {
+        public ConditionRegionNodeControlViewModel(CompositeConditionNode node):base(node)
+        {
+            
+        }
+    }
+}