Marker event has no marker name attached

[serg472]

A marker command inside a midi is followed by a string containing the marker name. Currently the marker name is not attached to the event, which can be easily fixed:

case 0x06:
  // Marker
  eventJson.name = 'Marker';
  eventJson.string = this.getStringData(eventStartIndex); //FIX
  break;

Thanks.