Add RomCenter INI deserialization test, fix issues

SabreTools.Models/RomCenter/Games.cs

@@ -4,5 +4,12 @@ namespace SabreTools.Models.RomCenter
     public class Games
     {
         public Rom[]? Rom { get; set; }
+
+        #region DO NOT USE IN PRODUCTION
+
+        /// <remarks>Should be empty</remarks>
+        public string[]? ADDITIONAL_ELEMENTS { get; set; }
+
+        #endregion
     }
 }