misc: Abstract repeated logic in markup extensions & move Updater into the base of the Avalonia project.

src/Ryujinx/Common/Markup/BasicMarkupExtension.cs

@@ -0,0 +1,20 @@
+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 abstract class BasicMarkupExtension : MarkupExtension 
+    {
+        protected abstract ClrPropertyInfo PropertyInfo { get; }
+        
+        public override object ProvideValue(IServiceProvider serviceProvider) =>
+            new CompiledBindingExtension(
+                new CompiledBindingPathBuilder()
+                    .Property(PropertyInfo, PropertyInfoAccessorFactory.CreateInpcPropertyAccessor)
+                    .Build()
+            ).ProvideValue(serviceProvider);
+    }
+}

src/Ryujinx/Common/Markup/MarkupExtensions.cs

@@ -0,0 +1,39 @@
+using Avalonia.Data.Core;
+using Projektanker.Icons.Avalonia;
+using Ryujinx.Ava.Common.Locale;
+
+namespace Ryujinx.Ava.Common.Markup
+{
+    internal class IconExtension(string iconString) : BasicMarkupExtension
+    {
+        protected override ClrPropertyInfo PropertyInfo
+            => new(
+                "Item",
+                _ => new Icon { Value = iconString },
+                null,
+                typeof(Icon)
+            );
+    }
+    
+    internal class SpinningIconExtension(string iconString) : BasicMarkupExtension
+    {
+        protected override ClrPropertyInfo PropertyInfo
+            => new(
+                "Item",
+                _ => new Icon { Value = iconString, Animation = IconAnimation.Spin },
+                null,
+                typeof(Icon)
+            );
+    }
+    
+    internal class LocaleExtension(LocaleKeys key) : BasicMarkupExtension
+    {
+        protected override ClrPropertyInfo PropertyInfo
+            => new(
+                "Item",
+                _ => LocaleManager.Instance[key],
+                null,
+                typeof(string)
+            );
+    }
+}