Start creating Dictionary-based internal models

SabreTools.Models/Internal/Dump.cs

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+using System.Xml.Serialization;
+using Newtonsoft.Json;
+
+namespace SabreTools.Models.Internal
+{
+    [JsonObject("dump"), XmlRoot("dump")]
+    public class Dump : DatItem
+    {
+        #region Keys
+
+        /// <remarks>Rom</remarks>
+        public const string MegaRomKey = "megarom";
+
+        /// <remarks>Original</remarks>
+        public const string OriginalKey = "original";
+
+        /// <remarks>Rom</remarks>
+        public const string RomKey = "rom";
+
+        /// <remarks>Rom</remarks>
+        public const string SCCPlusCartKey = "sccpluscart";
+
+        #endregion
+
+        public Dump() => Type = ItemType.Dump;
+    }
+}