Git commits in Moodle 3.6.x by Henning Bostelmann

commit 0e141964e04fb6ba6279597ade6c13083e00aaed
Author: Henning Bostelmann <henning.bostelmann@york.ac.uk>
Date:   Sat, 14 Jul 2018 01:25:28 +0800
Tag:    v3.6.0-beta

MDL-62914 Calendar: handle TZURL iCal property