Start adding currently-unused models

SabreTools.Models/Listxml/Feature.cs

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+using System.Xml;
+using System.Xml.Serialization;
+
+namespace SabreTools.Models.Listxml
+{
+    [XmlRoot("feature")]
+    public class Feature
+    {
+        /// <remarks>(protection|timing|graphics|palette|sound|capture|camera|microphone|controls|keyboard|mouse|media|disk|printer|tape|punch|drum|rom|comms|lan|wan)</remarks>
+        [XmlAttribute("type")]
+        public string Type { get; set; }
+
+        /// <remarks>(unemulated|imperfect)</remarks>
+        [XmlAttribute("status")]
+        public string? Status { get; set; }
+
+        /// <remarks>(unemulated|imperfect)</remarks>
+        [XmlAttribute("overall")]
+        public string? Overall { get; set; }
+    }
+}