Git commits in Moodle 3.8.3 by Brendan Heywood

commit db94d504f7ae938a267b4b3b688426bd4fa053f6
Author: Brendan Heywood <brendan@catalyst-au.net>
Date:   Sat, 18 Apr 2020 18:36:44 +0800
Tag:    v3.8.3

MDL-68443 xmldb: Improve path validation on view_xml action

commit af97e880717218dd0f281f2685249e149d84726d
Author: Brendan Heywood <brendan@catalyst-au.net>
Date:   Thu, 12 Mar 2020 06:33:57 +0800
Tag:    v3.8.3

MDL-68125 core: Fixed $CFG->reverseproxyignore install regression