Infra: Capitalisation Consistency (#6296)

* Rename Ryujinx.UI.Common

* Rename Ryujinx.UI.LocaleGenerator

* Update in Files

AboutWindow

* Configuration State

* Rename projects

* Ryujinx/UI

* Fix build

* Main remaining inconsistencies

* HLE.UI Namespace

* HLE.UI Files

* Namespace

* Ryujinx.UI.Common.Configuration.UI

* Ryujinx.UI.Common,Configuration.UI Files

* More instances

src/Ryujinx.UI.Common/Configuration/AudioBackend.cs

@@ -0,0 +1,14 @@
+using Ryujinx.Common.Utilities;
+using System.Text.Json.Serialization;
+
+namespace Ryujinx.UI.Common.Configuration
+{
+    [JsonConverter(typeof(TypedStringEnumConverter<AudioBackend>))]
+    public enum AudioBackend
+    {
+        Dummy,
+        OpenAl,
+        SoundIo,
+        SDL2,
+    }
+}