Calendar on desktop#34

Currently the Android versions has a nice Calendar built-in, it would be super awesome to have it on Desktop also.

yess, it’s on iOS too and needs some work (on MacOs and iOS)

I want to see some updates to the calendar app as well. The biggest problem with the calendar app (on iOS at least) it that it only supports Gmail/Google Apps and Exhange Calendars. This limits the usability of the app way too much. Please add native calendar support and CalDAV support.

I think this could be merged with #35