WooCommerce Waitlist 2.4.16

Fix: Some specific setups for variations were not sending out Mailouts incorrectly

Fix: version meta update running query unnecessarily
Fix: mailouts not always sending for parent product bundles

Added: Import/export options for waitlist data within WooCommerce's product exporter
Added: Waitlist elements will now show by default within Elementor template
Added: Option for double opt-in (via email) for non-registered users when joining waitlist
Added: Filter to disable showing waitlist within Elementor template (wcwl_add_waitlist_for_elementor)
Added: minimal styling to button on archive page to avoid overlap