[Pas2js] fullcalendar

[Michael Van Canneyt]

Hi,

A small heads-up:

FullCalendar.io released a new version (5) of their calendar component.
Unfortunately, the API is incompatible with version 4.
(alas, happens often in the Javascript world)

As a result:
The Fullcalendar unit has been renamed to fullcalendar4, and a new
fullcalendar5 unit has been added which contains the definitions for V5.

I added a new example for V5, which demonstrates also adding an event popup
using libbootstrap (which was also updated, by the way).

As a reminder, the demos are online at:
https://www.freepascal.org/~michael/pas2js-demos/fullcalendar/

Michael.