misc: move Models & Helpers into Common & Avalonia projects

src/Ryujinx/Utilities/AppLibrary/LdnGameDataReceivedEventArgs.cs

@@ -0,0 +1,10 @@
+using System;
+using System.Collections.Generic;
+
+namespace Ryujinx.Ava.Utilities.AppLibrary
+{
+    public class LdnGameDataReceivedEventArgs : EventArgs
+    {
+        public IEnumerable<LdnGameData> LdnData { get; set; }
+    }
+}