All Products for WooCommerce Subscriptions 6.0.4

* Feature - Let customers add carts to subscriptions without necessarily offering cart plans using `add_filter( 'wcsatt_add_cart_to_subscription_supported', '__return_true' );`.
* Fix - Cart-level plan selector is unresponsive when ordering again.
* Fix - Bundle/composite container price appears empty in mini-cart widget when making a one-time purchase.
* Fix - Ensure that the product object exists when restoring the subscription state of bundled products from order items.
* Fix - Fatal error when trying to switch a deleted product.

* Feature - Add quickview support in Flatsome.
* Tweak - Keep subscription plan options visible in Bundles (version 6.4+) and Composites (version 7.1+) when form validation fails.
* Fix - Fixed some issues with Bundle/Composite container cart item prices/subtotals when using 'Item Grouping > Flat/None'.

* Fix - Recurring coupons not applied to subscriptions that contain items purchased using a cart subscription plan when running manual AutomateWoo workflows.
* Fix - Product Bundles and Composite Products with a fixed-length plan cannot be switched.