Start adding currently-unused models

SabreTools.Models/Listxml/Input.cs

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+using System.Xml;
+using System.Xml.Serialization;
+
+namespace SabreTools.Models.Listxml
+{
+    [XmlRoot("input")]
+    public class Input
+    {
+        /// <remarks>(yes|no) "no"</remarks>
+        [XmlAttribute("service")]
+        public string? Service { get; set; }
+
+        /// <remarks>(yes|no) "no"</remarks>
+        [XmlAttribute("tilt")]
+        public string? Tilt { get; set; }
+
+        /// <remarks>Numeric?</remarks>
+        [XmlAttribute("players")]
+        public string Players { get; set; }
+
+        /// <remarks>Numeric?</remarks>
+        [XmlAttribute("coins")]
+        public string? Coins { get; set; }
+
+        /// <remarks>Numeric?</remarks>
+        [XmlElement("control")]
+        public Control[]? Control { get; set; }
+    }
+}