message: Use range-for loop for mine locations
diff: @@ -413,12 +413,12 @@ void TileMap::serialize(NAS2D::Xml::XmlElement* element)
  XmlElement *mines = new XmlElement("mines");
  element->linkEndChild(mines);
  - for (std::size_t i = 0; i < mMineLocations.size(); ++i)
  + for (const auto& location : mMineLocations)
  {
  XmlElement *mine = new XmlElement("mine");
  - mine->attribute("x", mMineLocations[i].x);
  - mine->attribute("y", mMineLocations[i].y);
  - getTile(mMineLocations[i], TileMapLevel::LEVEL_SURFACE).mine()->serialize(mine);
  + mine->attribute("x", location.x);
  + mine->attribute("y", location.y);
  + getTile(location, TileMapLevel::LEVEL_SURFACE).mine()->serialize(mine);
  mines->linkEndChild(mine);
  }
  