Git commits in Moodle 3.5.9 by Michael Hawkins

commit 72f5a6e119f1d0c64e3a79699afe43548f93e4fe
Author: Michael Hawkins <michaelh@moodle.com>
Date:   Tue, 29 Oct 2019 16:29:46 +0800
Tag:    v3.5.9

MDL-66161 output: Escaping fatal error message and URL strings