Start creating Dictionary-based internal models

SabreTools.Models/Internal/Device.cs

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+using System.Xml.Serialization;
+using Newtonsoft.Json;
+
+namespace SabreTools.Models.Internal
+{
+    [JsonObject("device"), XmlRoot("device")]
+    public class Device : DatItem
+    {
+        #region Keys
+
+        /// <remarks>Extension[]</remarks>
+        public const string ExtensionKey = "extension";
+
+        /// <remarks>string</remarks>
+        public const string FixedImageKey = "fixed_image";
+
+        /// <remarks>Instance</remarks>
+        public const string InstanceKey = "instance";
+
+        /// <remarks>string</remarks>
+        public const string InterfaceKey = "interface";
+
+        /// <remarks>(0|1) "0"</remarks>
+        public const string MandatoryKey = "mandatory";
+
+        /// <remarks>string</remarks>
+        public const string TagKey = "tag";
+
+        /// <remarks>(unknown|cartridge|floppydisk|harddisk|cylinder|cassette|punchcard|punchtape|printout|serial|parallel|snapshot|quickload|memcard|cdrom|magtape|romimage|midiin|midiout|picture|vidfile)</remarks>
+        public const string DeviceTypeKey = "type";
+
+        #endregion
+
+        public Device() => Type = ItemType.Device;
+    }
+}