code: func (actor Actor) StartApplication(appGUID string) (Application, Warnings, error) {
  	updatedApp, warnings, err := actor.CloudControllerClient.UpdateApplicationStart(appGUID)
  	if err != nil {
  		return Application{}, Warnings(warnings), err
  	}
  
  	return actor.convertCCToActorApplication(updatedApp), Warnings(warnings), nil
  }
docs: // StartApplication starts an application.