message: Add tile overlay color for TruckRouting
diff: @@ -11,14 +11,16 @@ std::map<Tile::Overlay, NAS2D::Color> OverlayColorTable =
  {
  { Tile::Overlay::None, NAS2D::Color::Normal },
  { Tile::Overlay::Communications, { 125, 200, 255 } },
  - { Tile::Overlay::Connectedness, NAS2D::Color::Green }
  + { Tile::Overlay::Connectedness, NAS2D::Color::Green },
  + { Tile::Overlay::TruckingRoutes, NAS2D::Color::Orange }
  };
  std::map<Tile::Overlay, NAS2D::Color> OverlayHighlightColorTable =
  {
  { Tile::Overlay::None, NAS2D::Color{ 125, 200, 255 } },
  { Tile::Overlay::Communications, { 100, 180, 230 } },
  - { Tile::Overlay::Connectedness, NAS2D::Color{ 71, 224, 146 } }
  + { Tile::Overlay::Connectedness, NAS2D::Color{ 71, 224, 146 } },
  + { Tile::Overlay::TruckingRoutes, NAS2D::Color{ 125, 200, 255 } }
  };
  