Synchronize native Enigma2 channels every six hours and migrate preferences

Tests/Program.cs

@@ -125,6 +125,7 @@ using(var relay=new LiveStreamRelay(new System.Net.Http.HttpClient(relayHandler)
  Check(System.Text.Json.JsonSerializer.Serialize(relay.Status()).Contains("\"ActiveSources\":0"),"receiver connection released after final consumer");
 }
 await SavedChannelPlaybackTests.Run(Check);
+await ChannelSyncTests.Run(Check);
 public class PathsProxy : DispatchProxy
 {
  public string Folder;