Start creating Dictionary-based internal models

SabreTools.Models/Internal/Disk.cs

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+using System.Xml.Serialization;
+using Newtonsoft.Json;
+
+namespace SabreTools.Models.Internal
+{
+    [JsonObject("disk"), XmlRoot(elementName: "disk")]
+    public class Disk : DatItem
+    {
+        #region Keys
+
+        /// <remarks>string</remarks>
+        public const string FlagsKey = "flags";
+
+        /// <remarks>string, possibly long</remarks>
+        public const string IndexKey = "index";
+
+        /// <remarks>string</remarks>
+        public const string MD5Key = "md5";
+
+        /// <remarks>string</remarks>
+        public const string MergeKey = "merge";
+
+        /// <remarks>string</remarks>
+        public const string NameKey = "name";
+
+        /// <remarks>(yes|no) "no"</remarks>
+        public const string OptionalKey = "optional";
+
+        /// <remarks>string</remarks>
+        public const string RegionKey = "region";
+
+        /// <remarks>string</remarks>
+        public const string SHA1Key = "sha1";
+
+        /// <remarks>(baddump|nodump|good|verified) "good"</remarks>
+        public const string StatusKey = "status";
+
+        /// <remarks>(yes|no) "no"</remarks>
+        public const string WritableKey = "writable";
+
+        #endregion
+
+        public Disk() => Type = ItemType.Disk;
+    }
+}