* Fix: Email classes now pass the WC_Email object under the standard 'email' key, restoring compatibility with WooCommerce email customiser plugins
* Fix: Recipient address is now passed as 'recipient' in email templates (previously 'email') to align with WooCommerce conventions
* Compatibility: Tested with WordPress 6.9.4 and WooCommerce 10.7.0
* Note: Waitlist email template compatibility was updated for the new email variables - sites with theme overrides should review and update overridden templates as needed: replace $email_class with $email (WC_Email object) and $email with $recipient (address string)
* Fix: sortable admin column query not working for all values, updated to be simpler and handle edge cases
* Fix: added update function for waitlist counts when using the update counts tool
* Fix: user deletion, when processed on the frontend, was not properly removing users from the waitlists
* Fix: Email not always being added to events waitlist form for logged in users causing silent error
* Added: Various fixes to comply with PHPCS
* Added: Filters to hide notices on the frontend (wcwl_show_notice_on_frontend)
* Added: Altered frontend flow to allow join/leave buttons to show without having to dismiss notices
* Added: Action hook to output custom HTML before submit button for waitlist forms (wcwl_before_form_submit_button)
* Added: Action hook to apply additional validation to waitlist join/leave requests (wcwl_process_waitlist_request_start)
* Added: Product ID/object to various frontend filters to allow for easier customisation
* Added: Deprecation notice for old supported products filter
* Added: Sorting products by waitlist count in the admin will now show all products (previously it did not return those with no waitlist data)
* Fix: Updated function to calculate count totals to target variable products as well