New features

Adding a new field of AddtoCalendar type

Below settings are only available in Add to calendar field:-

* Disabled Text: Text to be displayed if disabled.

* Start Date: Collect event start date and provide configuration similar to end
date.

* Show add to calendar widget: Available to end user for allowing the user to
disable the widget on particular event or expired events or show a message
like event expired from Disabled Text option.

Fix all issues

- Developers can use Drupal Service as an API to generate PDF files. Refer README.md
- All config for the module is usable
- Only thing left is PDF generation for Drupal entities

Tag release