JetAppointments Booking for Elementor 2.1.2

* ADD: Appointments Group Created event for Workflows;
* UPD: Automatically switch to month with first available date in the Appointment calendar;
* FIX: Better JetFormBuilder compatibility;
* FIX: Avoid false triggering for CHange Appointment Status event;
* FIX: PHP warnings in some cases;
* FIX: Problem with default time in timepicker when current date selected.

n/a

* FIX: Better server-side check for appointment time availability;
* FIX: Attach Add Slot event to slots wrapper context to avoid unexpected behaviour;
* FIX: Calendar arrows direction in RTL;
* FIX: Show loader while getting new providers;
* FIX: Form error when using time range with only start time;
* FIX: Prevent PHP errors in some cases;
* FIX: Click on capacity doesn't select slot.