message: UI-QT: minor bugfix to play/pause button.
  The button should now correctly show "play" when the current image is not involved in a simulation.
diff: @@ -58,7 +58,9 @@ ControlWidget::ControlWidget(std::shared_ptr<State> state, SpinWidget *spinWidge
  void ControlWidget::updateData()
  {
  // Check for running simulations - update Play/Pause Button
  - if (Simulation_Running_Anywhere_Collection(state.get()))
  + if ( Simulation_Running_Collection(state.get()) ||
  + Simulation_Running_Chain(state.get()) ||
  + Simulation_Running_Image(state.get()) )
  this->pushButton_PlayPause->setText("Pause");
  else
  this->pushButton_PlayPause->setText("Play");
  