VikBooking 1.18.15

Reservation model improvements for payment method detection.
Chat mediator support for dispatching mobile App Push notifications (Task Manager).
Task Manager framework improvements.
New Door Access Control driver for "offline/fixed" access codes.
Automatic checked-in registration for first-access detection in Door Access Control.
Introducing Events Observer for platform dispatcher.
Dropped support for SVG files in Chat Mediator to improve security.
Multiple low-severity security fixes for CSRF and XSS prevention.