Support of the Google Calendar API


Add support for the Google Calendar API which allows a bi-directional communication between the Calendar and the client. Events can be changed in the Google Calendar and this is instantly reflected in the client eg. Airtable. But the most important thing: the refreshing over iCal feeds with Google is very slow, sometimes people don’t see their update in days.
Because the Google Calendar is the most used/important calendar support of the API would make much sense.