1. 移除了FlipflopContext，统一流程API

2. Script项目脚本修复了 RawString 原始字符串存在的问题
3. Script使用了ValueNode统一了值类型节点，为后续扩展更多的值类型做准备
4. TypeHelper.ToTypeOfString()方法中添加了部分值类型的"Type[]”与“List<Type>”的显式定义，用于脚本在类型中定义数组成员
5. Script项目脚本默认挂载的json方法拆分为jsonObj(String)与jsonStr(Object)以支持序列化与反序列化
6. 项目保存为dnf项目文件时，将不再保存名称为”Default"并且没有节点的画布，避免重复保存时默认画布增多。

NodeFlow/Env/LocalFlowEnvironment.cs

@@ -339,9 +339,14 @@ namespace Serein.NodeFlow.Env
             var projectData = new SereinProjectData()
             {
                 Librarys = this._flowLibraryService.GetAllLibraryInfo().ToArray(),
-                Nodes = _flowModelService.GetAllNodeModel().Select(node => node.ToInfo()).Where(info => info is not null).ToArray(),
-                Canvass = _flowModelService.GetAllCanvasModel().Select(canvas => canvas.ToInfo()).ToArray(),
-                //StartNode = NodeModels.Values.FirstOrDefault(it => it.IsStart)?.Guid,
+                Nodes = _flowModelService.GetAllNodeModel()
+                                         .Select(node => node.ToInfo())
+                                         .Where(info => info is not null)
+                                         .ToArray(),
+                Canvass = _flowModelService.GetAllCanvasModel()
+                                           .Where(canvas => canvas.Nodes.Count != 0 && !"Default".Equals(canvas.Name))
+                                           .Select(canvas => canvas.ToInfo())
+                                           .ToArray(),
             };
 
             return projectData;