* Tweak: Clear cache when order updated.
* Tweak: Clear database cache faster when API Resource no longer exists.
Tweak: On Order edit update of Access Expires and/or Activations, process API cache refresh in task queue rather than immediately.
Tweak: Delete API Key activations when WooCommerce Subscription transitions to on-hold status.
* Feature: Added a product_list API endpoint which returns a unique list of product data such as Titles and Product IDs with no authentication required.
* Fix: get_human_time_diff() method returned slightly incorrect time for date.
* Fix: Order edit API Resources meta box > Activation Expires field displays only a date now rather than friendly messages such as "4 days", as friendly messages broke updates using a value that was not recognized as valid.
* Fix: Order edit API Resources meta box > Activation Expires help tip was displayed for WooCommerce Subscription when it should be hidden.
* Fix: Order edit API Resources meta box > Activation Expires field was updated when the Update button was clicked without changing the value manually. No update should have occurred.
* Tweak: Prevent Order edit API Resources meta box > Activation Expires field from being set to value less than current value.