Start creating Dictionary-based internal models

SabreTools.Models/Internal/Software.cs

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+using System.Xml.Serialization;
+using Newtonsoft.Json;
+
+namespace SabreTools.Models.Internal
+{
+    [JsonObject("software"), XmlRoot("software")]
+    public class Software : DatItem
+    {
+        #region Keys
+
+        /// <remarks>string</remarks>
+        public const string CloneOfKey = "cloneof";
+
+        /// <remarks>string</remarks>
+        public const string DescriptionKey = "description";
+
+        /// <remarks>Info[]</remarks>
+        public const string InfoKey = "info";
+
+        /// <remarks>string</remarks>
+        public const string NameKey = "name";
+
+        /// <remarks>string</remarks>
+        public const string NotesKey = "notes";
+
+        /// <remarks>Part[]</remarks>
+        public const string PartKey = "part";
+
+        /// <remarks>string</remarks>
+        public const string PublisherKey = "publisher";
+
+        /// <remarks>SharedFeat[]</remarks>
+        public const string SharedFeatKey = "sharedfeat";
+
+        /// <remarks>(yes|partial|no) "yes"</remarks>
+        public const string SupportedKey = "supported";
+
+        /// <remarks>string</remarks>
+        public const string YearKey = "year";
+
+        #endregion
+
+        public Software() => Type = ItemType.Software;
+    }
+}