完成mvvm模式下，画布、节点编辑的基本重构

Library/FlowNode/FlowCanvasDetailsInfo.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Serein.Library
+{
+
+    /// <summary>
+    /// 画布信息
+    /// </summary>
+    public class FlowCanvasDetailsInfo
+    {
+        /// <summary>
+        /// 起始节点Guid
+        /// </summary>
+        public string StartNode;
+
+        /// <summary>
+        /// 标识画布ID
+        /// </summary>
+        public string Guid;
+
+        /// <summary>
+        /// 画布名称
+        /// </summary>
+        public string Name;
+
+        /// <summary>
+        /// 画布宽度
+        /// </summary>
+        public double Width;
+
+        /// <summary>
+        /// 画布高度
+        /// </summary>
+        public double Height;
+
+        /// <summary>
+        /// 预览位置X
+        /// </summary>
+        public double ViewX;
+
+        /// <summary>
+        /// 预览位置Y
+        /// </summary>
+        public double ViewY;
+
+        /// <summary>
+        /// 缩放比例X
+        /// </summary>
+        public double ScaleX;
+
+        /// <summary>
+        /// 缩放比例Y
+        /// </summary>
+        public double ScaleY;
+    }
+}