Add archive.org deserialization test, fix issues

SabreTools.Models/ArchiveDotOrg/Files.cs

@@ -6,7 +6,19 @@ namespace SabreTools.Models.ArchiveDotOrg
     [XmlRoot("files")]
     public class Files
     {
-        [XmlElement]
+        [XmlElement("file")]
         public File[]? File { 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
     }
 }