Start creating Dictionary-based internal models

SabreTools.Models/Internal/Input.cs

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+using System.Xml.Serialization;
+using Newtonsoft.Json;
+
+namespace SabreTools.Models.Internal
+{
+    [JsonObject("input"), XmlRoot("input")]
+    public class Input : DatItem
+    {
+        #region Keys
+
+        /// <remarks>long</remarks>
+        public const string ButtonsKey = "buttons";
+
+        /// <remarks>long</remarks>
+        public const string CoinsKey = "coins";
+
+        /// <remarks>string / Control[]</remarks>
+        public const string ControlKey = "control";
+
+        /// <remarks>long</remarks>
+        public const string PlayersKey = "players";
+
+        /// <remarks>(yes|no) "no"</remarks>
+        public const string ServiceKey = "service";
+
+        /// <remarks>(yes|no) "no"</remarks>
+        public const string TiltKey = "tilt";
+
+        #endregion
+
+        public Input() => Type = ItemType.Input;
+    }
+}