Fixed and Updated so that plugin can work properly

- Change hook name from woocommerce_payment_complete to woocommerce_order_status_pending_to_completed and woocommerce_order_status_on-hold_to_completed  because woocommerce_payment_complete never is called for child order role , so that fixed the problem that can't update next payment date for original order
- Define  early_renew_calculate_next_payment_date() function for this plugin so that is support Renew for Subscription in Trial Time
- Change Renew text name to Early Renew text name for button so that buyers are not confused with Renew of Cancelled Subscription