Git commits in Moodle 3.5.0 by Troy Williams

commit f9a7a98a4a795d66f4a8c5f8cabb263ecdb21d64
Author: Troy Williams <troy.williams@learningworks.co.nz>
Date:   Tue, 24 Apr 2018 12:01:04 +0800
Tag:    v3.5.0-rc1

MDL-61012 course: Allow extending class to set