message: Wrap LEVEL_STRING_TABLE into unnamed namespace
diff: extern NAS2D::Point<int> MOUSE_COORDS;
  +namespace
  +{
  std::map<int, std::string> LEVEL_STRING_TABLE =
  {
  {constants::DepthSurface, constants::LevelSurface},
  @@ -30,6 +32,7 @@ std::map<int, std::string> LEVEL_STRING_TABLE =
  {constants::DepthUnderground3, constants::Levelunderground3},
  {constants::DepthUnderground4, constants::Levelunderground4}
  };
  +}
  void MapViewState::drawSystemButton() const
  