重构了底层，方便向Android、Web、Linux进行跨平台迁移

Library/Api/IDynamicFlowNode.cs

@@ -0,0 +1,13 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Serein.Library.Api
+{
+    public interface IDynamicFlowNode
+    {
+    }
+
+}