message: Use auto for robots type
diff: @@ -439,7 +439,7 @@ void StructureManager::serialize(NAS2D::Xml::XmlElement* element)
  {
  auto* robotsElement = new NAS2D::Xml::XmlElement("robots");
  - const RobotList& robots = static_cast<RobotCommand*>(it->first)->robots();
  + const auto& robots = static_cast<RobotCommand*>(it->first)->robots();
  std::stringstream str;
  for (std::size_t i = 0; i < robots.size(); ++i)
  