message: Use named Color constant Yellow in TextField::update
diff: @@ -321,7 +321,7 @@ void TextField::update()
  const auto showFocused = hasFocus() && editable();
  renderer.drawImageRect(rect(), (showFocused ? mSkinFocus : mSkinNormal));
  - if (highlight()) { renderer.drawBox(rect(), 255, 255, 0); }
  + if (highlight()) { renderer.drawBox(rect(), NAS2D::Color::Yellow); }
  drawCursor();
  