Move ItemType to untyped base class

SabreTools.DatItems/DatItem.cs

@@ -84,6 +84,11 @@ namespace SabreTools.DatItems
 
         #region Fields
 
+        /// <summary>
+        /// Item type for the object
+        /// </summary>
+        protected abstract ItemType ItemType { get; }
+
         /// <summary>
         /// Internal model wrapped by this DatItem
         /// </summary>
@@ -703,14 +708,8 @@ namespace SabreTools.DatItems
     /// </summary>
     public abstract class DatItem<T> : DatItem, IEquatable<DatItem<T>>, IComparable<DatItem<T>>, ICloneable where T : Models.Metadata.DatItem
     {
-        // TODO: Move to base class after implementation
         #region Fields
 
-        /// <summary>
-        /// Item type for the object
-        /// </summary>
-        protected abstract ItemType ItemType { get; }
-
         /// <summary>
         /// Key for accessing the item name, if it exists
         /// </summary>
@@ -765,7 +764,6 @@ namespace SabreTools.DatItems
 
         #endregion
 
-        // TODO: Figure out how to replace individual versions with this
         #region Cloning Methods
 
         /// <summary>