WooCommerce Subscriptions 6.9.0

New: Provide custom options for subscription My Account endpoints. PR#2511
Fix: Reinitialize tooltips after changing switching settings. PR#2517
Fix: Only add inclusive tax rates to renewal cart items if product is taxable. PR#2524
Fix: [WC3.3] Fix switching between grouped products by ensuring the switch request arguments are posted to the add to cart form. PR#2535
Fix: Use correct meta key and compare argument when getting subscriptions with wcs_get_subscriptions() when ordered by end or trial date. PR#2528

* Fix: Use line item meta values in a WC version compatible way. PR#2469
* Fix: Only log cache manager messages if the logger has been loaded. PR#2468
* Fix: Init `WC()->mailer()` to make sure our retry email classes are available and loaded. PR#2476
* Fix: Update calls to 'woocommerce_payment_complete_order_status' to include order as 3rd argument. PR#2503
* Fix: Prevent wp_kses from stripping off the allow_clear attribute of Select2 elements. PR#2354
* Fix: Update `woocommerce_cart_totals_coupon_html` filter to include an extra arg introduced in WC 3.0. PR#2447
* Fix: Ensure the Upcoming Revenue report correctly calculates revenue in periods beyond the next payment date. PR#2461
* Fix: [WC3.2] Print the order downloads table in renewal order emails. PR#2522
* Fix: [WC3.3] Replace uses of deprecated `woocommerce_params` with 'woocommerce_get_script_data'. PR#2509
* Fix: [WC3.3] Get the active set of PayPal API credential depending on the gateway mode. PR#2514
* Fix: [WC3.3] Display the filter by customer on the admin subscriptions table. PR#2521
* Tweak: Add Subscriptions template overrides to system status. PR#2422
* Tweak: Do not empty cart when adding additional units of a subscription product when mixed checkout is disabled. PR#2464
* Tweak: Trigger a `do_action` when customers remove and readd line items to their subscription. PR#2458
* Tweak: Untrash subscriptions when parent order is untrashed. PR#2472
* Tweak: Skip the My Account Subscriptions table, linking directly to the subscription if customer only has one. PR#2474
* Tweak: Change the subscription product length/expiration label from 'Expire after' to Subscription length. PR#2483
* Tweak: Reword the Mixed Checkout setting description. PR#2490
* Tweak: Cache user subscriptions to improve performance of limitation queries and user API functions. PR#2388
* Tweak: Pass the `$number` parameter to callbacks hooked onto `woocommerce_subscription_periods` and `woocommerce_subscription_trial_periods`. PR#2520

* Fix: Update PayPal doc links. PR#2414
* Fix: [WC3.2] Make sure Subscriptions checks if the PayPal credentials have changed on correct hook. PR#2430
* Fix: Only allow subscription line items to be removed from the My Account page when they should be allowed. PR#2440
* Fix: Fix subscription ranges transient key when user has different language/locale than site default. PR#2286
* Fix: Replace use of deprecated function with wc_get_cart_url(). PR#2442
* Fix: Force payment method selection when switching when manual renewals are disabled. PR#2348
* Tweak: Deprecate WC_Subscriptions::add_notice() and WC_Subscriptions:rint_notices(). PR#2453
* Tweak: Display "Free" for shipping that costs 0 only. PR#2437
* Tweak: Format PayPal totals as strings when comparing. PR#2271
* Tweak: Improve recurring fee support. PR#2462