WooCommerce Composite Products 10.4.0

* Fix - Fixed some cases of unpredictable Hide Component action in Scenarios with masked Components.
* Fix - Invalid markup generated when rendering Component Descriptions (nested paragraphs).
* Fix - Price in selection details template incorrectly hidden if 'Option Prices' is set to 'Hidden'.
* Tweak - Added a section in the WordPress Privacy Policy Guide to let store owners know that Composite Products does not collect, store or share personal data.

* Fix - Sticky add-to-cart button behavior in Storefront 2.3+ when 'Form location' is 'After summary'.
* Tweak - Improved integration with Storefront 2.3.
* Tweak - Improved Summary widget styles in Fixed display mode.
* Tweak - Added back extension template overrides in WooCommerce System Report.

* Fix - WooCommerce Subscriptions: Paying for failed initial/parent order with composited subscription products creates new order and subscription.
* Tweak - Composite container & child cart line item subtotals are now aggregated as displayed.
* Tweak - Speed up removing/restoring Composites in the cart by using 'woocommerce_remove_cart_item' and 'woocommerce_restore_cart_item' instead of 'woocommerce_cart_item_removed' and 'woocommerce_cart_item_restored'.