Add Logiqx deserialization test, fix issues

SabreTools.Models/Logiqx/Header.cs

@@ -6,7 +6,7 @@ namespace SabreTools.Models.Logiqx
     [XmlRoot("header")]
     public class Header
     {
-        [XmlAttribute("name")]
+        [XmlElement("name")]
         public string Name { get; set; }
 
         [XmlElement("description")]
@@ -61,5 +61,17 @@ namespace SabreTools.Models.Logiqx
         public string? Type { get; set; }
 
         #endregion
+
+        #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
     }
 }