Add support for Squirrel installation

.gitignore

@@ -1,6 +1,8 @@
 bin/
 obj/
-build/
+/Releases
+/publish
+/publish.sh
 /packages/
 riderModule.iml
 /_ReSharper.Caches/

VRCOSC.Desktop/Program.cs

@@ -1,8 +1,10 @@
 // Copyright (c) VolcanicArts. Licensed under the GPL-3.0 License.
 // See the LICENSE file in the repository root for full license text.
 
+using System.Runtime.Versioning;
 using osu.Framework;
 using osu.Framework.Platform;
+using Squirrel;
 using VRCOSC.Game;
 
 namespace VRCOSC.Desktop;
@@ -11,8 +13,31 @@ public static class Program
 {
     public static void Main()
     {
+        initSquirrel();
+
         using GameHost host = Host.GetSuitableDesktopHost(@"VRCOSC");
         using osu.Framework.Game game = new VRCOSCGame();
         host.Run(game);
     }
+
+    [SupportedOSPlatform("windows")]
+    private static void initSquirrel()
+    {
+        SquirrelAwareApp.HandleEvents(onInitialInstall: OnAppInstall, onAppUninstall: OnAppUninstall, onEveryRun: OnAppRun);
+    }
+
+    private static void OnAppInstall(SemanticVersion version, IAppTools tools)
+    {
+        tools.CreateShortcutForThisExe();
+    }
+
+    private static void OnAppUninstall(SemanticVersion version, IAppTools tools)
+    {
+        tools.RemoveShortcutForThisExe();
+    }
+
+    private static void OnAppRun(SemanticVersion version, IAppTools tools, bool firstRun)
+    {
+        tools.SetProcessAppUserModelId();
+    }
 }

VRCOSC.Desktop/VRCOSC.Desktop.csproj

@@ -17,4 +17,7 @@
   <ItemGroup Label="Resources">
     <EmbeddedResource Include="game.ico" />
   </ItemGroup>
+  <ItemGroup>
+    <PackageReference Include="Clowd.Squirrel" Version="2.9.40" />
+  </ItemGroup>
 </Project>