Add OfflineList deserialization test, fix issues

SabreTools.Models/OfflineList/To.cs

@@ -9,13 +9,27 @@ namespace SabreTools.Models.OfflineList
         [XmlAttribute("value")]
         public string? Value { get; set; }
 
+        /// <remarks>Boolean</remarks>
         [XmlAttribute("default")]
-        public bool? Default { get; set; }
+        public string? Default { get; set; }
 
+        /// <remarks>Boolean</remarks>
         [XmlAttribute("auto")]
-        public bool? Auto { get; set; }
+        public string? Auto { get; set; }
 
         [XmlElement("find")]
         public Find[]? Find { get; set; }
+
+        #region DO NOT USE IN PRODUCTION
+
+        /// <remarks>Should be empty</remarks>
+        [XmlAnyAttribute]
+        public XmlAttribute[]? ADDITIONAL_ATTRIBUTES { get; set; }
+
+        /// <remarks>Should be empty</remarks>
+        [XmlAnyElement]
+        public object[]? ADDITIONAL_ELEMENTS { get; set; }
+
+        #endregion
     }
 }