Add method to easily register "reply" events

[tupini07]

Currently, we need to use the RegisterLocal method to register a reply event, as well as the EventManagerConstants.ReplyPrefix to fill the name of the event. Since this constant is internal and we want to avoid unnecessary duplication we should implement a wrapper method that accepts the name of the event and automatically registers it as a reply callback. An idea for this implementation:

RegisterLocalReply(eventName, callback) {
  RegisterLocal(
    EventManagerConstants.ReplyPrefix + eventName,
    callback
  );
}