Update with recovered code from VM binaries (Jan 1)

- ShellDemo: Updated all pages with recovered code, added AppShell.cs
- TodoApp: Updated core files, added converters
- XamlBrowser: Added recovered sample

XamlBrowser/MauiProgram.cs

@@ -0,0 +1,22 @@
+using Microsoft.Maui.Controls.Hosting;
+using Microsoft.Maui.Hosting;
+using Microsoft.Maui.Platform.Linux;
+using Microsoft.Maui.Platform.Linux.Hosting;
+
+namespace XamlBrowser;
+
+public static class MauiProgram
+{
+	public static void Main(string[] args)
+	{
+		MauiAppBuilder obj = MauiApp.CreateBuilder(true);
+		AppHostBuilderExtensions.UseMauiApp<BrowserApp>(obj).UseLinux();
+		LinuxApplication.Run(obj.Build(), args, delegate(LinuxApplicationOptions options)
+		{
+			options.Title = "XAML Browser";
+			options.Width = 1200;
+			options.Height = 800;
+			options.UseGtk = true;
+		});
+	}
+}