WooCommerce API Manager 3.4.1

* New: If an API Resource is a line item on a WC Subscriptions renewal order, a URL link is displayed leading to the parent order where API Resources are displayed.
* Dev: Added the WC_AM_ENABLE_CACHE constant. To disable caching add define( 'WC_AM_ENABLE_CACHE', false ); to wp-config.php.
* Dev: Template code optimizations.
- api-keys.php
- api-downloads.php

* New: Cleanup API Resource and API Key activations if WooCommerce Subscription goes into on-hold status from active status.
* New: Rebuild API Resource if WooCommerce Subscription goes into active status from on-hold status.

* Update: Refactored templates/emails/api-keys-order-complete.php to place data in a table, and to add more details.
* Update: Refactored templates/emails/plain/api-keys-order-complete.php to add more details.
* Dev: Added woocommerce-api-manager/includes/wcam-time-functions.php - Functions must be called using the plugins_loaded action hook.
* Dev: New action hooks added:
- wc_am_before_order_partially_refunded
- wc_am_after_order_partially_refunded
- wc_am_before_order_fully_refunded
- wc_am_after_order_fully_refunded
- wc_am_before_refund_deleted
- wc_am_after_refund_deleted
- wc_am_before_remove_order
- wc_am_after_remove_order
- wc_am_before_delete_order
- wc_am_after_delete_order
- wc_am_before_delete_order_item
- wc_am_after_delete_order_item
- wc_am_before_delete_sub_order_item
- wc_am_after_delete_sub_order_item