Clean up some using statements

src/MayShow.Shared/ViewModels/AboutViewModel.cs

@@ -1,22 +1,4 @@
-#nullable enable
-
-using System;
-using System.Collections.ObjectModel;
-using System.Globalization;
-using System.IO;
-using System.Linq;
-using System.Threading.Tasks;
-using Avalonia.Platform.Storage;
-using Avalonia.Themes.Fluent;
 using DialogHostAvalonia;
-using ImageMagick;
-using MigraDoc.DocumentObjectModel;
-using MigraDoc.Rendering;
-using PdfSharp.Fonts;
-using PdfSharp.Pdf.IO;
-using PdfSharp.Snippets.Font;
-using MayShow.Interfaces;
-using MayShow.Models;
 
 namespace MayShow.ViewModels;
 

src/MayShow.Shared/ViewModels/BaseViewModel.cs

@@ -1,9 +1,5 @@
-using Avalonia.Controls;
-using MayShow.Helpers;
+using MayShow.Helpers;
 using MayShow.Interfaces;
-using System;
-using System.Collections.Generic;
-using System.Text;
 
 namespace MayShow.ViewModels;
 

src/MayShow.Shared/ViewModels/ConfirmViewModel.cs

@@ -1,5 +1,3 @@
-#nullable enable
-
 using DialogHostAvalonia;
 using MayShow.Helpers;
 

src/MayShow.Shared/ViewModels/CreatePDFReportViewModel.cs

@@ -1,5 +1,3 @@
-#nullable enable
-
 using System;
 using System.Collections.ObjectModel;
 using System.IO;