Support events with UTC timezones

[jafonseca]

The property timezone needs to be changed from Boolean to String to allow setting a custom value. FullCalendar supports storing events in UTC and rendering in users local timezone by setting timezone: "local".

File: scheduler-component.html
151: timezone: String,

Currently only the default setting of "false" is supported and setting the Boolean to "true" has no impact.

See: https://fullcalendar.io/docs/timezone/timezone/

[HaithemMosbahi]

Hi,
Thank you for rising this issue. You're right the timezone property needs to be changed.
I will make the needed changes and publish a new version as soon as possible.