Start creating Dictionary-based internal models

SabreTools.Models/Internal/Configuration.cs

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+using System.Xml.Serialization;
+using Newtonsoft.Json;
+
+namespace SabreTools.Models.Internal
+{
+    [JsonObject("configuration"), XmlRoot("configuration")]
+    public class Configuration : DatItem
+    {
+        #region Keys
+
+        /// <remarks>Condition</remarks>
+        public const string ConditionKey = "condition";
+
+        /// <remarks>ConfLocation[]</remarks>
+        public const string ConfLocationKey = "conflocation";
+
+        /// <remarks>ConfSetting[]</remarks>
+        public const string ConfSettingKey = "confsetting";
+
+        /// <remarks>string</remarks>
+        public const string MaskKey = "mask";
+
+        /// <remarks>string</remarks>
+        public const string NameKey = "name";
+
+        /// <remarks>string</remarks>
+        public const string TagKey = "tag";
+
+        #endregion
+
+        public Configuration() => Type = ItemType.Configuration;
+    }
+}