Git merges in Moodle 3.5.6 by Andrew Nicols

commit 30ac3bcfeb740472fc9df2edf72b37a66f0179ca
Author: Andrew Nicols <andrew@nicols.co.uk>
Date:   Fri, 10 May 2019 11:43:13 +0800
Tag:    v3.5.6

Merge branch 'MDL-63959-35' of git://github.com/tobiasreischmann/moodle into MOODLE_35_STABLE

commit 02dc7147c708254d302e1bb854fd60e37d94df62
Author: Andrew Nicols <andrew@nicols.co.uk>
Date:   Thu, 09 May 2019 14:52:13 +0800
Tag:    v3.5.6

Merge branch 'MDL-65435_35' of git://github.com/stronk7/moodle into MOODLE_35_STABLE

commit 473145c2c7accd31c0d16f3e1ed03a64ce6f4e10
Author: Andrew Nicols <andrew@nicols.co.uk>
Date:   Wed, 08 May 2019 09:48:33 +0800
Tag:    v3.5.6

Merge branch 'MDL-35396-35' of git://github.com/mihailges/moodle into MOODLE_35_STABLE

commit a4c878c7343f176e65128b30eefe1fb75c73650b
Author: Andrew Nicols <andrew@nicols.co.uk>
Date:   Fri, 03 May 2019 08:54:29 +0800
Tag:    v3.5.6

Merge branch 'MDL-64394-accesslog-MOODLE_35_STABLE' of https://github.com/brendanheywood/moodle into MOODLE_35_STABLE