Start creating Dictionary-based internal models

SabreTools.Models/Internal/Chip.cs

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+using System.Xml.Serialization;
+using Newtonsoft.Json;
+
+namespace SabreTools.Models.Internal
+{
+    [JsonObject("chip"), XmlRoot("chip")]
+    public class Chip : DatItem
+    {
+        #region Keys
+
+        /// <remarks>long</remarks>
+        public const string ClockKey = "clock";
+
+        /// <remarks>string</remarks>
+        public const string FlagsKey = "flags";
+
+        /// <remarks>string</remarks>
+        public const string NameKey = "name";
+
+        /// <remarks>(yes|no) "no"</remarks>
+        public const string SoundOnlyKey = "soundonly";
+
+        /// <remarks>string</remarks>
+        public const string TagKey = "tag";
+
+        /// <remarks>(cpu|audio)</remarks>
+        public const string ChipTypeKey = "type";
+
+        #endregion
+
+        public Chip() => Type = ItemType.Chip;
+    }
+}