Initial release of the Config Export to PHP array module.
Add option to display menu icons.
New setting available in admin page to display a list of available icons for each menu link.
If selected, editors can select an icon from a dropdown list when editing a menu item.
This icon (key|value) is then passed as a variable to the menu's Twig template.
It's still responsability of the front end developer to actually display an icon based on this variable.
Example yourtheme/templates/menus/menu--main.html.twig:
yourtheme/templates/menus/menu--main.html.twig