完成mvvm模式下，画布、节点编辑的基本重构

NodeFlow/FlowWorkOptions.cs

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+using Microsoft.Extensions.ObjectPool;
+using Serein.Library;
+using Serein.Library.Api;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Serein.NodeFlow
+{
+
+    public class FlowTask
+    {
+        /// <summary>
+        /// 是否异步启动流程
+        /// </summary>
+        public bool IsTaskAsync { get; set; }  
+
+        /// <summary>
+        /// 流程起始节点
+        /// </summary>
+        public Func<NodeModelBase> GetStartNode { get; set; }
+
+        /// <summary>
+        /// 获取当前画布流程的所有节点
+        /// </summary>
+        public Func<List<NodeModelBase>> GetNodes { get; set; }
+    }
+
+    /// <summary>
+    /// 节点任务执行依赖
+    /// </summary>
+    public class FlowWorkOptions()
+    {
+        /// <summary>
+        /// 流程运行环境
+        /// </summary>
+        public IFlowEnvironment Environment { get; set; }// = environment;
+
+        /// <summary>
+        /// 表示运行环境状态
+        /// </summary>
+        public CancellationTokenSource CancellationTokenSource { get; } = new CancellationTokenSource();
+
+        /// <summary>
+        /// 上下文线程池
+        /// </summary>
+        public Serein.Library.Utils.ObjectPool<IDynamicContext> FlowContextPool { get; set; }   
+
+        /// <summary>
+        /// 每个画布需要启用的节点
+        /// </summary>
+        public Dictionary<string, FlowTask> Flows { get; set; }
+
+        /// <summary>
+        /// 当前任务加载的所有节点
+        /// </summary>
+        //public List<NodeModelBase> Nodes { get; set; }// = nodes;
+
+        /// <summary>
+        /// 需要注册的类型
+        /// </summary>
+        public Dictionary<RegisterSequence, List<Type>> AutoRegisterTypes { get; set; } //= autoRegisterTypes;
+
+        /// <summary>
+        /// 初始化时需要的方法
+        /// </summary>
+        public List<MethodDetails> InitMds { get; set; }// = initMds;
+        /// <summary>
+        /// 加载时需要的方法
+        /// </summary>
+        public List<MethodDetails> LoadMds { get; set; }// = loadMds;
+        /// <summary>
+        /// 退出时需要调用的方法
+        /// </summary>
+        public List<MethodDetails> ExitMds { get; set; } //= exitMds;
+    }
+
+}