Start creating Dictionary-based internal models

SabreTools.Models/Internal/DatItem.cs

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+using System.Collections.Generic;
+using System.Xml.Serialization;
+using Newtonsoft.Json;
+
+namespace SabreTools.Models.Internal
+{
+    /// <summary>
+    /// Format-agnostic representation of item data
+    /// </summary>
+    public class DatItem : Dictionary<string, object?>
+    {
+        #region Common Keys
+
+        public const string TypeKey = "_type";
+
+        #endregion
+
+        /// <summary>
+        /// Quick accessor to item type, if it exists
+        /// </summary>
+        [JsonProperty("itemtype", DefaultValueHandling = DefaultValueHandling.Ignore), XmlElement("itemtype")]
+        public ItemType? Type
+        {
+            get => ContainsKey(TypeKey) ? this[TypeKey] as ItemType? : null;
+            set => this[TypeKey] = value;
+        }
+
+        #region Reading Helpers
+
+        /// <summary>
+        /// Read a key as a bool, returning null on error
+        /// </summary>
+        public bool? ReadBool(string key)
+        {
+            if (string.IsNullOrWhiteSpace(key))
+                return null;
+            if (!ContainsKey(key))
+                return null;
+            return this[key] as bool?;
+        }
+
+        /// <summary>
+        /// Read a key as a double, returning null on error
+        /// </summary>
+        public double? ReadDouble(string key)
+        {
+            if (string.IsNullOrWhiteSpace(key))
+                return null;
+            if (!ContainsKey(key))
+                return null;
+            return this[key] as double?;
+        }
+
+        /// <summary>
+        /// Read a key as a long, returning null on error
+        /// </summary>
+        public long? ReadLong(string key)
+        {
+            if (string.IsNullOrWhiteSpace(key))
+                return null;
+            if (!ContainsKey(key))
+                return null;
+            return this[key] as long?;
+        }
+
+        /// <summary>
+        /// Read a key as a string, returning null on error
+        /// </summary>
+        public string? ReadString(string key)
+        {
+            if (string.IsNullOrWhiteSpace(key))
+                return null;
+            if (!ContainsKey(key))
+                return null;
+            return this[key] as string;
+        }
+    
+        #endregion
+    }
+}