Revert "Remove conflict"

This reverts commit 235a293.

Author: peternewell

Source/Orts.Formats.Msts/SoundManagmentFile.cs

@@ -21,6 +21,7 @@
 using System.Diagnostics;
 using System.Linq;
 using System.Text;
+using Orts.Formats.Msts;
 using Orts.Parsers.Msts;
 
 namespace Orts.Formats.Msts