Kill ProgressiveFileCopier and seek to end for ongoing livetv

MediaBrowser.Controller/Library/ILiveStream.cs

@@ -2,6 +2,7 @@
 
 #pragma warning disable CA1711, CS1591
 
+using System.IO;
 using System.Threading;
 using System.Threading.Tasks;
 using MediaBrowser.Model.Dto;
@@ -25,5 +26,7 @@ namespace MediaBrowser.Controller.Library
         Task Open(CancellationToken openCancellationToken);
 
         Task Close();
+
+        Stream GetStream(bool seekNearEnd = true);
     }
 }