misc: move Models & Helpers into Common & Avalonia projects

src/Ryujinx/Common/Models/Amiibo/AmiiboApiUsage.cs

@@ -0,0 +1,12 @@
+using System.Text.Json.Serialization;
+
+namespace Ryujinx.Ava.Common.Models.Amiibo
+{
+    public class AmiiboApiUsage
+    {
+        [JsonPropertyName("Usage")]
+        public string Usage { get; set; }
+        [JsonPropertyName("write")]
+        public bool Write { get; set; }
+    }
+}