WooCommerce Product Bundles 8.1.2

* Feature - Rolled 'Min/Max Items' feature plugin into Product Bundles.
* Feature - Introduced 'Default Quantity' field.
* Feature - Added Flatsome quickview support.
* Tweak - Display running bundle total even if validation messages exist.
* Tweak - Keep bundled product quantity selectors unconstrained by stock, and always visible.

* Fix - Fixed an edge-case issue that prevented Product Bundles with discounted, mandatory items from appearing as on sale in the catalog.
* Tweak - Preserve runtime meta when cloning parent item in shipping packages.

* Tweak - Added responsive styles. 380px form-width breakpoint is editable using the 'woocommerce_bundle_front_end_params' filter.
* Tweak - Made various small styling tweaks in Product Bundle pages.
* Tweak - Added styles for basic improved compatibility with the Astra and Flatsome themes.
* Tweak - Backfill current bundled item data in bundle configurations extracted from orders.