added 5.1 and 7.1 options to add audio track

increased plugin versions to 0.6.1
fixed issue with replace original returning -11 instead of -1
fixed copy flie when on external node

BasicNodes/Tools/Executor.cs

@@ -45,10 +45,12 @@
 
         private NodeParameters args;
 
-        public override async Task Cancel()
+        public override Task Cancel()
         {
             args?.Process?.Cancel();
+            return Task.CompletedTask;
         }
+
         public override int Execute(NodeParameters args)
         {
             this.args = args;