improve:截图及浮动栏及代码优化

Ink Canvas/MainWindow_cs/MW_PPT.cs

@@ -1,8 +1,4 @@
-using Ink_Canvas.Helpers;
-using iNKORE.UI.WPF.Modern;
-using Microsoft.Office.Core;
-using Microsoft.Office.Interop.PowerPoint;
-using System;
+using System;
 using System.IO;
 using System.Runtime.InteropServices;
 using System.Security.Cryptography;
@@ -12,6 +8,10 @@ using System.Threading.Tasks;
 using System.Windows;
 using System.Windows.Media;
 using System.Windows.Threading;
+using Ink_Canvas.Helpers;
+using iNKORE.UI.WPF.Modern;
+using Microsoft.Office.Core;
+using Microsoft.Office.Interop.PowerPoint;
 using Application = System.Windows.Application;
 using File = System.IO.File;
 using MessageBox = System.Windows.MessageBox;