Merge branch '96-provide-ics-data-for-calendar' into 'develop'

Resolve "Provide ICS Data for calendar"

Closes #96

See merge request t3o/typo3.org!274
3 jobs for 285-add-share-buttons-for-social-networks-e-g-twitter-etc in 2 minutes and 44 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
passed test:php #12947

00:00:20

 
  Build
passed build #12948

00:00:34

 
  Layout
passed layout #12949

00:01:49