message: set_element_presence -> SetElementPresence
diff: @@ -20,12 +20,12 @@ namespace vcpkg::Commands::PortsDiff
  };
  template <class T>
  - struct set_element_presence
  + struct SetElementPresence
  {
  - static set_element_presence create(std::vector<T> left, std::vector<T> right)
  + static SetElementPresence create(std::vector<T> left, std::vector<T> right)
  {
  // TODO: This can be done with one pass instead of three passes
  - set_element_presence output;
  + SetElementPresence output;
  std::set_difference(left.cbegin(), left.cend(), right.cbegin(), right.cend(), std::back_inserter(output.only_left));
  std::set_intersection(left.cbegin(), left.cend(), right.cbegin(), right.cend(), std::back_inserter(output.both));
  std::set_difference(right.cbegin(), right.cend(), left.cbegin(), left.cend(), std::back_inserter(output.only_right));
  @@ -122,7 +122,7 @@ namespace vcpkg::Commands::PortsDiff
  std::vector<std::string> current_ports = Maps::extract_keys(current_names_and_versions);
  std::vector<std::string> previous_ports = Maps::extract_keys(previous_names_and_versions);
  - const set_element_presence<std::string> setp = set_element_presence<std::string>::create(current_ports, previous_ports);
  + const SetElementPresence<std::string> setp = SetElementPresence<std::string>::create(current_ports, previous_ports);
  const std::vector<std::string>& added_ports = setp.only_left;
  if (!added_ports.empty())
  