infra: Make Avalonia the default UI (#6375)

* misc: Move Ryujinx project to Ryujinx.Gtk3

This breaks release CI for now but that's fine.

Signed-off-by: Mary Guillemard <mary@mary.zone>

* misc: Move Ryujinx.Ava project to Ryujinx

This breaks CI for now, but it's fine.

Signed-off-by: Mary Guillemard <mary@mary.zone>

* infra: Make Avalonia the default UI

Should fix CI after the previous changes.

GTK3 isn't build by the release job anymore, only by PR CI.

This also ensure that the test-ava update package is still generated to
allow update from the old testing channel.

Signed-off-by: Mary Guillemard <mary@mary.zone>

* Fix missing copy in create_app_bundle.sh

Signed-off-by: Mary Guillemard <mary@mary.zone>

* Fix syntax error

Signed-off-by: Mary Guillemard <mary@mary.zone>

---------

Signed-off-by: Mary Guillemard <mary@mary.zone>

src/Ryujinx/Common/Locale/LocaleExtension.cs

@@ -0,0 +1,40 @@
+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.Locale
+{
+    internal class LocaleExtension : MarkupExtension
+    {
+        public LocaleExtension(LocaleKeys key)
+        {
+            Key = key;
+        }
+
+        public LocaleKeys Key { get; }
+
+        public override object ProvideValue(IServiceProvider serviceProvider)
+        {
+            LocaleKeys keyToUse = Key;
+
+            var builder = new CompiledBindingPathBuilder();
+
+            builder.SetRawSource(LocaleManager.Instance)
+                .Property(new ClrPropertyInfo("Item",
+                obj => (LocaleManager.Instance[keyToUse]),
+                null,
+                typeof(string)), (weakRef, iPropInfo) =>
+                {
+                    return PropertyInfoAccessorFactory.CreateInpcPropertyAccessor(weakRef, iPropInfo);
+                });
+
+            var path = builder.Build();
+
+            var binding = new CompiledBindingExtension(path);
+
+            return binding.ProvideValue(serviceProvider);
+        }
+    }
+}