JetAppointments Booking for Elementor 2.1.4

* ADD: Allow to export appointments;
* ADD: Macros `Custom DB Column Value` to get the data from custom DB columns in Workflows;
* UPD: Compatibility with new WooCommerce REST API checkout;
* FIX: Minor Workflows UI bugs;
* FIX: Service meta macros inside Workflows.

* UPD: Allow to set user_name column value from front-end form;
* FIX: Avoid incorrect date calculations for some timezones;
* FIX: Duplicating form field for date selection in the JetPopup;
* FIX: Available slot calculation when system time not matching webiste timezone;
* FIX: Appointments table creation for some cases.

* ADD: Workflows functionality;
* ADD: Zoom integration;
* ADD: Timezones picker for the front-end appointments calendar UI;
* ADD: Public actions functionality (confirm and cancel appoinments by URL);
* ADD: Allow to override day schedule with Working Days settings;
* UPD: Admin UI improvements;
* FIX: SQL errors on MySQL 8.0 or higher;
* FIX: Allow to set 0 into service price.