* Fix: When discounting from sale price, use regular price to calculate discounted price if product has empty sale price. Restores strikethrough discount html.
* Fix: PHP notice for undefined $price variable in sale price filter.
* Fix: Support grid styles in quickview modal in Storefront theme.
* Tweak: Change strings and buttons to use "edit|reset selections" instead of "configuration"
* Tweak: Astra support for mobile grids.
* Tweak: Use h4 headings for child product titles.
* Tweak: Remove styles from reset button, inherit from theme button styles.
* Tweak: Refine Mix and Match configuration display in cart block.