[DatFile, DatItem] Fix desc-to-name replacements

Previously, sets that had multiple items would trigger issues because of shared information in the items, mostly the Machine parts. By making all of it a clone, it takes a little more memory but ends up resolving all issues in desc-to-name mapping and replacement.

SabreTools.Library/Dats/Disk.cs

@@ -4,7 +4,7 @@ using SabreTools.Library.Data;
 
 namespace SabreTools.Library.Dats
 {
-	public class Disk : DatItem, ICloneable
+	public class Disk : DatItem
 	{
 		#region Private instance variables
 
@@ -71,7 +71,7 @@ namespace SabreTools.Library.Dats
 
 		#region Cloning Methods
 
-		public object Clone()
+		public new object Clone()
 		{
 			return new Disk()
 			{
@@ -79,7 +79,7 @@ namespace SabreTools.Library.Dats
 				Type = this.Type,
 				Dupe = this.Dupe,
 
-				Machine = this.Machine,
+				Machine = (Machine)this.Machine.Clone(),
 
 				Supported = this.Supported,
 				Publisher = this.Publisher,