Author: Gareth Barnard
MDL-79802 core_h5p: Add a new setting for adding custom H5P styles.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=a1326ff471ae6d61212d5539b66defa38b41008e
http://github.com/moodle/moodle/commit/a1326ff471ae6d61212d5539b66defa38b41008e
+ 4.2 en [h5pcustomcss,core_h5p]
+ 4.2 en [h5pcustomcss_help,core_h5p]