* Misc-Remove the SkyVerge help menu item as part of the plugin assets

* Fix -Fatal Error when checking out with Checkout Field Editor extension active.
* Fix -Pre-Order fee not applying to variable products.
* Fix -Fatal error when trashing some products.
* Fix -Prevent fatal errors when switching an order to “Pre ordered” without a pre-order product.
* Tweak-Fix wording of release date within confirmation emails when no release date is set.
* Tweak-Add Additional Content text to applicable Pre-Order emails.
* Tweak-Add “Pre-ordered” status to WC reports statuses for revenue reporting.
* Tweak-Use native wp_timezone_string() to retrieve WP timezone setting.
* Tweak-Check that order exists when updating payment complete status to avoid fatal errors.

* Fix-Prevent fatal error when viewing coupons in admin with Subscriptions.
* Fix-Update reward messages when using a regular coupon.
* Fix-Only apply points to previous orders which have been paid.
* Tweak-Use standard format for help tips in settings.
* Tweak-Remove legacy code for wc_points_balance.

* Fix -Fatal error when viewing Bookings order.