Easy Digital Downloads - Recurring Payments 2.12.3

New: Add support for the PayPal Commerce gateway.
Fix: Software Licensing - The wrong expiration date could be calcualted when using one-time trials.
Fix: Software Licensing - Upgrade logic now accounts for different license lengths with variable prices.
Fix: PayPal Express - Renweal IPN could have incorrect payment amount recorded in EDD.
Fix: A discount code could modify a $0 trial to a non-zero amount.
Fix: Tax calculations were improved when using Signup Fees.
Fix: EDD 3.0 - Updated more references to the `post_` function calls.
Fix: EDD 3.0 - Orders table viwes were still using wp_count_posts for payments.
Fix: EDD 3.0 - Recurring Payments may overwrite the order status parameter when querying orders.

Fix: Stripe - Renewal payments not being recorded correctly for zero decimal currencies.
Fix: EDD 3.0 - Unable to capture Stripe payment intents with zero decimal currencies.
Fix: EDD 3.0 - Automatic renewal payments not inheriting tax rate from parent order.

Improvement: Added HTML IDs to Software Licensing error notices.
Fix: "Cancel Subscription" checkbox shows even if there is no subscription associated with the payment.
Fix: Undefined index error in add_subscription_cart_details() method.
Fix: It was possible to have a note added to a subscription about a status change, even if the actual status change failed. Now the note is only added if the database record updated successfully.
Fix: Fatal errors when running old database upgrades.
Dev: Ensure PayPal functions file is always loaded.
EDD 3.0: Add "Cancel Subscription" checkbox to the new refund UI.