Git commits in Moodle 3.8.x by Cameron Ball

commit 37ee0fd966ddafba3b912b067903d22040d69ff9
Author: Cameron Ball <cameron@moodle.com>
Date:   Tue, 30 Jun 2020 10:12:33 +0800
Tag:    v3.8.4

MDL-69106 assignfeedback_editpdf: Keep files in conversion queue

commit 315e4342f1648567e9038d618fa1a2961fe478db
Author: Cameron Ball <cameron@moodle.com>
Date:   Tue, 30 Jul 2019 13:19:08 +0800
Tag:    v3.8.0-beta

MDL-66279 task: Test if logger is_a database_logger