Author: Ferran Recio
MDL-67734 core_xapi: add xAPI statement support webservice
http://git.moodle.org/gw?p=moodle.git;a=commit;h=1d4c6f5355c12974f03f28f15121f2d9f7c5ce59
http://github.com/moodle/moodle/commit/1d4c6f5355c12974f03f28f15121f2d9f7c5ce59
+ 3.9 en [eventxapipost,xapi]
+ 3.9 en [privacy:metadata,xapi]