* Added path validation for file upload.

* Dev-Update composer versions from v1 to v2.
* Dev-Update node version from 8.9.3 to 16.13.0.
* Dev-Update npm version from 5.5.1 to 8.0.0.
* Fix-Duplicate tickets appear after navigating off-site and returning to cart.
* Fix-When a ticket moves from Failed to Processing or Completed, it will remain in Trash.

* New-Debug mode can be turned on in settings to activate additional logging
* Tweak-Checks if ID is empty rather than null when ensuring that ID exists for sync

* Sensei LMS: Version bump to 4.7.1 https://raw.githubusercontent.com/Automattic/sensei/version/4.7.1/changelog.txt

* Fix-Ensure prices and discounts use the same precision value, to avoid Xero errors where the discount is more than the total price.
* Tweak-For variable products, remove item meta from the item description when sending to Xero.