message: Wrap file level global variables in unnamed namespace
diff: using namespace NAS2D;
  +namespace {
  constexpr int LIST_ITEM_HEIGHT = 30;
  -static const Font* MAIN_FONT = nullptr;
  -static const Font* MAIN_FONT_BOLD = nullptr;
  + const Font* MAIN_FONT = nullptr;
  + const Font* MAIN_FONT_BOLD = nullptr;
  -static constexpr Color ITEM_COLOR{0, 185, 0};
  -static constexpr Color HIGHLIGHT_COLOR{0, 185, 0, 75};
  + constexpr Color ITEM_COLOR{0, 185, 0};
  + constexpr Color HIGHLIGHT_COLOR{0, 185, 0, 75};
  -static int FIRST_STOP = 0;
  -static int SECOND_STOP = 0;
  + int FIRST_STOP = 0;
  + int SECOND_STOP = 0;
  +}
  static void drawItem(Renderer& renderer, ProductListBox::ProductListBoxItem& item, int x, int y, int w, int offset, bool highlight)
  