Navbar Cart Icons v1.0.0

First release.

Puts a Shopping Cart icon and a Checkout icon beside the hamburger button of
a ZCA Bootstrap navbar, on the screen sizes where the navbar is collapsed,
whenever the cart has something in it. Install it from Plugin Manager and
they're there; nothing in your template is edited, copied or overridden, and
uninstalling puts everything back.

Added

• One codebase for Zen Cart v1.5.8 through v3.0.0 and PHP 7.4 through 8.5,
  verified against all six release branches.
• Works with ZCA Bootstrap (3.3.0 through 3.8.0) and with clones of it, with
  nothing to configure. The icons follow the navbar's own navbar-expand-*
  breakpoint, so a template that expands its navbar at a different size still
  gets them exactly when it shows its hamburger.
• The icons link to the same two pages ZCA Bootstrap's own menu entries do,
  built with the same calls, and carry the same labels, so a store that has
  reworded or translated Shopping Cart and Checkout is followed.
• Each icon is a 44px touch target with finger room between them and before
  the hamburger; both are settings.
• Keep Everything On One Line? A store name, logo or trademark ahead of
  the icons shrinks and clips with an ellipsis rather than pushing the
  hamburger onto a second line on a narrow phone or a large-text setting.
• Settings for which icons show, whether the cart icon shows on an empty cart,
  an optional item-count badge, the Font Awesome classes of both icons, the
  color, hover color, size and spacing.
• The stylesheet can be overridden from your template (a
  navbar_cart_icons.css in its css/ directory is used instead) or switched
  off entirely if you'd rather style #navbarCartIcons yourself.
• A page that already carries id="navbarCartIcons" — a template holding a
  hand edit of the same thing — is left alone, so you can install first and
  remove the edit when convenient.
• Self-contained readme.html shipped with the plugin and linked, with the
  GitHub project page, as buttons in the Plugin Manager info panel.
• Idempotent installer. Settings you've changed are never reset by an upgrade;
  labels and help text are refreshed to the current version.
• While the plugin is switched off, Plugin Manager lists it as Navbar Cart
  Icons - Mod Not Turned On, on every supported release.