message: Use named color constants
diff: @@ -44,9 +44,9 @@ std::map<ResourceTrend, Point<float>> ICON_SLICE
  std::map<ResourceTrend, Color> TEXT_COLOR
  {
  - { RESOURCE_TREND_NONE, Color{255, 255, 255} },
  + { RESOURCE_TREND_NONE, Color::White },
  { RESOURCE_TREND_UP, Color{0, 185, 0} },
  - { RESOURCE_TREND_DOWN, Color{255, 0, 0} }
  + { RESOURCE_TREND_DOWN, Color::Red }
  };
  