Start creating Dictionary-based internal models

SabreTools.Models/Internal/SoftwareList.cs

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+using System.Xml.Serialization;
+using Newtonsoft.Json;
+
+namespace SabreTools.Models.Internal
+{
+    [JsonObject("softwarelist"), XmlRoot("softwarelist")]
+    public class SoftwareList : DatItem
+    {
+        #region Keys
+
+        /// <remarks>string</remarks>
+        public const string DescriptionKey = "description";
+
+        /// <remarks>string</remarks>
+        public const string FilterKey = "filter";
+
+        /// <remarks>string</remarks>
+        public const string NameKey = "name";
+
+        /// <remarks>string</remarks>
+        public const string NotesKey = "notes";
+
+        /// <remarks>Software[]</remarks>
+        public const string SoftwareKey = "software";
+
+        /// <remarks>(original|compatible)</remarks>
+        public const string StatusKey = "status";
+
+        /// <remarks>string</remarks>
+        public const string TagKey = "tag";
+
+        #endregion
+
+        public SoftwareList() => Type = ItemType.SoftwareList;
+    }
+}