WooCommerce Memberships 1.26.5

* Tweak - Allow merging existing user memberships in CSV imports without specifying a user membership ID if the user ID, login name or email address is provided in combination with the plan ID or slug
* Tweak - Ensure LearnDash course overview and status are hidden when restricted
* Tweak - Improve performance when generating restriction or discount notices that include products
* Tweak - Allow removing an installment plan flag on subscription-tied user memberships on CSV imports through an `installment_plan` column
* Fix - Ensure that if a variable product is excluded from receiving member discounts, all its variations are consistently excluded from discounts as well
* Fix - Ensure that the `customer` query var in User Memberships REST API requests to get user memberships by customer works consistently
* Fix - Pass the correct return type for the `display_post_states` filter callback
* Dev - Add WooCommerce debug logging when starting new user memberships CSV import jobs

* Fix - Ensure that the `wcm_restrict` shortcode can correctly parse optional attributes

* Feature - Allow to set an option to let hierarchical post types such as pages apply their restriction rules to their children
* Feature - Add a System Status Report block and send additional System Status Report data in WooCommerce API Status responses
* Feature - Add `wcm_product_discount` and `wcm_discounted_product` shortcodes to display member discounts for a given product to non-members
* Feature - Add user membership activated member emails triggered when delayed user memberships become active
* Tweak - Add the {membership_view_url} merge tag to member emails
* Tweak - Add {discount} merge tags for use in purchasing discount messages to inform non-members about available member discounts for a given product
* Tweak - Start delayed memberships automatically via cron job, besides delayed member login
* Tweak - Improve the performance of post restriction overrides when forcing posts and products public, excluding them from restriction rules
* Tweak - Improve the performance of product discount overrides when forcing products to be excluded from member discount rules
* Tweak - Add bulk actions to products and other restrictable post types to force content public or exclude products from member discounts, or to revert them to normal memberships handling
* Tweak - Do not display a "Pause" membership row action in the user memberships edit screen if the membership is cancelled
* Fix - If a customer tries to resubscribe to a subscription pending cancellation that is tied to a membership, ensure that the membership goes back to active status as well
* Fix - Link memberships created via "Grant access" action to manually-created subscriptions
* Fix - Ensure that shortcode attributes pass the shortcode name while running through the WordPress core filter in `shortcode_atts()`
* Fix - When a member resubscribes a cancelled subscription that is tied to a membership, make sure the cancelled period is added to the inactive interval of the membership, to ensure accuracy of content dripping
* Misc - Add support for WooCommerce REST API v3 routes
* Misc - Deliver webhook payloads according to the selected API version
* Misc - Ensure compatibility with WordPress 5.0 and the Gutenberg editor
* Misc - Update Action Scheduler library to version 2.1.1
* Dev - Add discount methods to retrieve the possible member discount amounts for a given product, based on any plan rule
* Dev - Remove SkyVerge Framework methods from template files and replace with template functions for better backwards compatibility