WooCommerce Composite Products 10.5.0

* Tweak - Move 'Product Data > Shipping > Composite 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 Composite Product pages (requires APFS 3.1+).
* Fix - Subscription plan prices in Composite Product pages not updating when changing Product Add-Ons created at Composite level.
* Fix - Resolved 'Undefined index' PHP warning when creating/editing products via the REST API.

* Fix - Component option discounts applied twice in the single product page when using the 'woocommerce_composited_product_discount_from_regular' filter to calculate discounts over sale prices.
* Fix - Viewport scrolling not working when the viewport is at the top of the page.

* Feature - Introduced new assembled/unassembled UI for Composite Products under the 'Product Data > Shipping' tab.
* Feature - Added 'Assembled weight' option under 'Product Data > Shipping' when the 'Assembled' Composite type is active.
* Feature - Support '/subscriptions' REST API endpoint.
* Feature - Introduced support for WooCommerce Memberships: Composite discounts are now inherited by individually-priced Components. Important: Only '%' discounts are supported!
* Tweak - Introduce filter-based method for discounting Component prices in the cart instead of modifying price props directly.
* Tweak - Show '/pc' suffix when max (not min) Component quantity > 1.
* Tweak - Added missing actions for before/after quantity input (thank you, bor0!).
* Tweak - Declared support for WooCommerce 3.9+