Original is cloneable and comparable

SabreTools.Data.Models/Metadata/Original.cs

@@ -1,24 +1,50 @@
+using System;
 using System.Xml.Serialization;
 using Newtonsoft.Json;
 
 namespace SabreTools.Data.Models.Metadata
 {
     [JsonObject("original"), XmlRoot("original")]
-    public class Original : DatItem
+    public class Original : DatItem, ICloneable, IEquatable<Original>
     {
         #region Properties
 
         public string? Content { get; set; }
 
-        #endregion
-
-        #region Keys
-
-        /// <remarks>bool</remarks>
-        public const string ValueKey = "value";
+        public bool? Value { get; set; }
 
         #endregion
 
         public Original() => ItemType = ItemType.Original;
+
+        /// <inheritdoc/>
+        public object Clone()
+        {
+            var obj = new Original();
+
+            obj.Content = Content;
+            obj.Value = Value;
+
+            return obj;
+        }
+
+        /// <inheritdoc/>
+        public bool Equals(Original? other)
+        {
+            // Null never matches
+            if (other is null)
+                return false;
+
+            // Properties
+            if ((Content is null) ^ (other.Content is null))
+                return false;
+            else if (Content is not null && !Content.Equals(other.Content, StringComparison.OrdinalIgnoreCase))
+                return false;
+
+            if (Value != other.Value)
+                return false;
+
+            return true;
+        }
     }
 }