New Feature: Upload Button Accepts New File Types

[eyalc]

Update :
Following this request , you can now upload iCalendar files to the Media Manager. Accepted extensions: ICS , ICAL , ICALENDAR , IFB .

Visitors can upload these files with an Upload Button configured to accept a Document.

FYI @poolshark314 @josemanuelribas @deleteduser @jamalejaz