Start creating Dictionary-based internal models

SabreTools.Models/Internal/DataArea.cs

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+using System.Xml.Serialization;
+using Newtonsoft.Json;
+
+namespace SabreTools.Models.Internal
+{
+    [JsonObject("dataarea"), XmlRoot("dataarea")]
+    public class DataArea : DatItem
+    {
+        #region Keys
+
+        /// <remarks>(big|little) "little"</remarks>
+        public const string EndiannessKey = "endianness";
+
+        /// <remarks>string</remarks>
+        public const string NameKey = "name";
+
+        /// <remarks>Rom[]</remarks>
+        public const string RomKey = "rom";
+
+        /// <remarks>long</remarks>
+        public const string SizeKey = "size";
+
+        /// <remarks>(8|16|32|64) "8"</remarks>
+        public const string WidthKey = "width";
+
+        #endregion
+
+        public DataArea() => Type = ItemType.DataArea;
+    }
+}