Clean up all files

Source/GrasscutterTools/Program.cs

@@ -1,22 +1,19 @@
 using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Threading.Tasks;
 using System.Windows.Forms;
 
 namespace GrasscutterTools
 {
-    static class Program
+    internal static class Program
     {
         /// <summary>
         /// 应用程序的主入口点。
         /// </summary>
         [STAThread]
-        static void Main()
+        private static void Main()
         {
             Application.EnableVisualStyles();
             Application.SetCompatibleTextRenderingDefault(false);
             Application.Run(new FormMain());
         }
     }
-}
+}