WooCommerce Product Bundles 8.3.5

* Important - Added context parameter to 'woocommerce_bundled_item_raw_price' filter. 'woocommerce_bundled_item_raw_price_cart' filter is no longer applied.
* Important - Added support for Composite Products 5.0+. Older versions of Composite Products are no longer supported!
* Tweak - Added context parameter to 'get_discount' and 'is_on_sale'.
* Tweak - Treat discounted bundled cart items as 'on-sale'.
* Fix - Fixed JS error when bundled variable product has no variation in stock.

* Important - Added support for WooCommerce 3.7+.
* Important - PHP 5.6.20+ is now required.
* Tweak - Ignore 'woocommerce_before_cart_item_quantity_zero' action under WC 3.7+.
* Tweak - Override 'WC_Product_Bundle::has_options'.
* Fix - Replace 'instock' product class with 'outofstock' and 'insufficientstock' classes when a Product Bundle contains mandatory items with insufficient stock.
* Fix - Variable Product default variation persists in Product Bundles even if it is filtered out.

* Fix - Order headings are missing from Pick Lists printed with the Print Invoices and Packing Lists extension.
* Fix - Show price suffix when bundle price is in range format.
* Fix - Broken empty state styles under WordPress 5.2+.