* Fix - PHP Notice: status was called incorrectly. Accessing order properties directly is deprecated since WooCommerce 3.0.
* Fix - Deprecated WC_Order_Item_Meta::__construct that is added since WooCommerce 3.1.
* Tweak - Better wording of order note related to the PayPal Advanced actions.
* Tweak - Make transaction ID in edit order screen clickable. This will bring store owner directly to the transaction detail in PayPal Manager site.
* Tweak - Add filter `woocommerce_paypal_advanced_args` to filter parameters that being sent to PayPal.
