Git commits in Moodle 3.7.x by Ruslan Kabalin

commit 0ceb6751aaf3d916043d121ce8bf10bba5ada620
Author: Ruslan Kabalin <ruslan.kabalin@gmail.com>
Date:   Mon, 08 Apr 2019 04:13:21 +0800
Tag:    v3.7.0-beta

MDL-65217 core_form: use uniqie element ids in listing.

commit 91a485a040ec8a83efe7386cf6f63d28ec5834c4
Author: Ruslan Kabalin <ruslan.kabalin@gmail.com>
Date:   Mon, 08 Apr 2019 03:33:47 +0800
Tag:    v3.7.0-beta

MDL-65217 core_form: use defined element id for filemanager.

commit 54e067dd472db387cd78d552fa99c5c75116546d
Author: Ruslan Kabalin <ruslan.kabalin@gmail.com>
Date:   Fri, 05 Apr 2019 05:33:50 +0800
Tag:    v3.7.0-beta

MDL-65217 core_form: use uniqie element id in filepicker

commit 493e7526f9c09fde822dfeb86a09e821e30d48b8
Author: Ruslan Kabalin <ruslan.kabalin@gmail.com>
Date:   Fri, 11 Jan 2019 18:44:38 +0800
Tag:    v3.7.0-beta

MDL-57898 core_customfield: Custom fields API