重构了底层，方便向Android、Web、Linux进行跨平台迁移

Library/Base/NodeBase.cs

@@ -0,0 +1,83 @@
+using Serein.Library.Entity;
+using Serein.Library.Enums;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace Serein.Library.Base
+{
+    public abstract class NodeBase
+    {
+        /// <summary>
+        /// 节点类型
+        /// </summary>
+        public abstract NodeControlType ControlType { get; set; }
+
+        /// <summary>
+        /// 方法描述，对应DLL的方法
+        /// </summary>
+        public abstract MethodDetails MethodDetails { get; set; }
+
+        /// <summary>
+        /// 节点guid
+        /// </summary>
+        public abstract string Guid { get; set; }
+
+        /// <summary>
+        /// 显示名称
+        /// </summary>
+        public abstract string DisplayName { get; set; }
+
+        /// <summary>
+        /// 是否为起点控件
+        /// </summary>
+        public abstract bool IsStart { get; set; }
+
+        /// <summary>
+        /// 运行时的上一节点
+        /// </summary>
+        public abstract NodeBase PreviousNode { get; set; }
+
+        /// <summary>
+        /// 上一节点集合
+        /// </summary>
+        public abstract List<NodeBase> PreviousNodes { get; set; }
+
+        /// <summary>
+        /// 下一节点集合（真分支）
+        /// </summary>
+        public abstract List<NodeBase> SucceedBranch { get; set; }
+
+        /// <summary>
+        /// 下一节点集合（假分支）
+        /// </summary>
+        public abstract List<NodeBase> FailBranch { get; set; }
+
+        /// <summary>
+        /// 异常分支
+        /// </summary>
+        public abstract List<NodeBase> ErrorBranch { get; set; }
+
+        /// <summary>
+        /// 上游分支
+        /// </summary>
+        public abstract List<NodeBase> UpstreamBranch { get; set; } 
+
+        /// <summary>
+        /// 当前执行状态（进入真分支还是假分支，异常分支在异常中确定）
+        /// </summary>
+        public abstract FlowStateType FlowState { get; set; } 
+
+        /// <summary>
+        /// 运行时的异常信息（仅在 FlowState 为 Error 时存在对应值）
+        /// </summary>
+        public abstract Exception RuningException { get; set; }
+
+        /// <summary>
+        /// 当前传递数据（执行了节点对应的方法，才会存在值）
+        /// </summary>
+        public abstract object FlowData { get; set; }
+
+    }
+}