WooCommerce Product Bundles 8.1.2

* Fix - Declared support for WooCommerce 4.0.
* Tweak - Check product type before modifying REST API responses

* Important - Bundled product Add-On prices are no longer preserved when Priced Individually is disabled. To restore this behavior, use the 'props' price filtering method, or (i) enable Priced Individually, (ii) enter a 100% Discount, and (iii) disable the 'Advanced Settings > Price Visibility > Product Details' option.
* Important - Bundled product discounts are now applied over sale prices by default.
* Feature - Add support for importing/exporting Bundle-Sells using the WC core Importer/Exporter.
* Fix - Support 'Grid' layout in REST API put/post requests.
* Fix - All Products for WooCommerce Subscriptions does not calculate regular subscription plan prices correctly when Product Add-Ons exist at Bundle or bundled item level (requires APFS 3.1+).
* Fix - Product Add-On precentage costs not calculated correctly in the cart.
* Fix - Added compatibility with Name Your Price 3.0.
* Fix - Prevent Quantity Max from being saved with zero value.
* Fix - Replace deprecated 'WC_Cache_Helper::incr_cache_prefix'.

* Tweak - Move 'Product Data > Shipping > Bundle type' div to priority 10000 to avoid conflicts with plugins that add their own fields in the Shipping tab.
* Fix - All Products for WooCommerce Subscriptions now applies discounts to Product Add-Ons correctly when calculating subscription plan prices in Product Bundle pages (requires APFS 3.1+).