docs: public static Icon getStockIcon(String name) {
      SoftReference<Icon> ref = iconcache.get(name);
      if(ref != null) {
        Icon icon = ref.get();
        if(icon != null) {
          return icon;
        }
      }
      java.net.URL imgURL = StockIcon.class.getResource(name + ".png");
      if(imgURL != null) {
        Icon icon = new ImageIcon(imgURL);
        iconcache.put(name, new SoftReference<>(icon));
        return icon;
      }
      LoggingUtil.warning("Could not find stock icon: " + name);
      return null;
    }