Changelog

Coupon editing and removal is now restricted for the coupon managed by this plugin
Coupon managed by this plugin is now explicitly marked in coupon listing
Shipping class editing is now restricted for the shipping class managed by this plugin
Shipping class managed by this plugin is now explicitly marked in shipping class listing
Added link to plugin configuration page to the corresponding plugin listing row
Added option to, on checkout, if free shipping is available, hide paid shipping methods

Improved handling of variable products
Added filter and action hooks extension points
Added option to disable product-page promotional message banner
Added column in product listing page to show whether a product grants free shipping or not
Added filter in product listing page to allow selecting only products that grant free shipping
Added quick actions in product listing page for enabling/disabling free shipping for a given product
Improved assets install/uninstall sequence