Start creating Dictionary-based internal models

SabreTools.Models/Internal/Part.cs

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+using System.Xml.Serialization;
+using Newtonsoft.Json;
+
+namespace SabreTools.Models.Internal
+{
+    [JsonObject("part"), XmlRoot("part")]
+    public class Part : DatItem
+    {
+        #region Keys
+
+        /// <remarks>DataArea[]</remarks>
+        public const string DataAreaKey = "dataarea";
+
+        /// <remarks>DiskArea[]</remarks>
+        public const string DiskAreaKey = "diskarea";
+
+        /// <remarks>DipSwitch[]</remarks>
+        public const string DipSwitchKey = "dipswitch";
+
+        /// <remarks>Feature[]</remarks>
+        public const string FeatureKey = "feature";
+
+        /// <remarks>string</remarks>
+        public const string InterfaceKey = "interface";
+
+        /// <remarks>string</remarks>
+        public const string NameKey = "name";
+
+        #endregion
+
+        public Part() => Type = ItemType.Part;
+    }
+}