message: Modify StructureManager to output food level for CommandCenter
diff: @@ -452,7 +452,8 @@ void StructureManager::serialize(NAS2D::Xml::XmlElement* element)
  structureElement->linkEndChild(robotsElement);
  }
  - if (structure->structureClass() == Structure::StructureClass::FoodProduction)
  + if (structure->structureClass() == Structure::StructureClass::FoodProduction ||
  + structure->structureId() == StructureID::SID_COMMAND_CENTER)
  {
  auto* food = new NAS2D::Xml::XmlElement("food");
  food->attribute("level", static_cast<FoodProduction*>(structure)->foodLevel());
  