Avalonia: Move LocaleExtension & IconExtension into one namespace to simplify the usage sites in the markup.

src/Ryujinx/Common/MarkupExtensions/IconExtension.cs

@@ -0,0 +1,26 @@
+using Avalonia.Data.Core;
+using Avalonia.Markup.Xaml;
+using Avalonia.Markup.Xaml.MarkupExtensions;
+using Avalonia.Markup.Xaml.MarkupExtensions.CompiledBindings;
+using System;
+
+namespace Ryujinx.Ava.Common.Markup
+{
+    internal class IconExtension(string iconString) : MarkupExtension
+    {
+        private ClrPropertyInfo PropertyInfo
+            => new(
+                "Item",
+                _ => new Projektanker.Icons.Avalonia.Icon { Value = iconString },
+                null,
+                typeof(Projektanker.Icons.Avalonia.Icon)
+            );
+
+        public override object ProvideValue(IServiceProvider serviceProvider) =>
+            new CompiledBindingExtension(
+                new CompiledBindingPathBuilder()
+                    .Property(PropertyInfo, PropertyInfoAccessorFactory.CreateInpcPropertyAccessor)
+                    .Build()
+            ).ProvideValue(serviceProvider);
+    }
+}