重新设计了FlowLIbrary相关类；为工作台默认添加了基础依赖、默认画布。

NodeFlow/Tool/DynamicCompiler.cs

@@ -1,13 +1,7 @@
 using Microsoft.CodeAnalysis;
 using Microsoft.CodeAnalysis.CSharp;
 using Microsoft.CodeAnalysis.Emit;
-using System;
-using System.Collections.Generic;
-using System.IO;
-using System.Linq;
 using System.Reflection;
-using System.Text;
-using System.Threading.Tasks;
 
 namespace Serein.NodeFlow.Tool
 {