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/UserError.cs

@@ -0,0 +1,39 @@
+namespace Ryujinx.UI.Common
+{
+    /// <summary>
+    /// Represent a common error that could be reported to the user by the emulator.
+    /// </summary>
+    public enum UserError
+    {
+        /// <summary>
+        /// No error to report.
+        /// </summary>
+        Success = 0x0,
+
+        /// <summary>
+        /// No keys are present.
+        /// </summary>
+        NoKeys = 0x1,
+
+        /// <summary>
+        /// No firmware is installed.
+        /// </summary>
+        NoFirmware = 0x2,
+
+        /// <summary>
+        /// Firmware parsing failed.
+        /// </summary>
+        /// <remarks>Most likely related to keys.</remarks>
+        FirmwareParsingFailed = 0x3,
+
+        /// <summary>
+        /// No application was found at the given path.
+        /// </summary>
+        ApplicationNotFound = 0x4,
+
+        /// <summary>
+        /// An unknown error.
+        /// </summary>
+        Unknown = 0xDEAD,
+    }
+}