Author: Damyon Wiese
MDL-59206 event: Add an event for a config_log
This is useful because config_logs are sent via logstores, and we may be interested to know how
many people change a particular admin setting across many sites (aggregated data).
http://git.moodle.org/gw?p=moodle.git;a=commit;h=f28c0c7245cb4ea3787784582cea667888cf1815
http://github.com/moodle/moodle/commit/f28c0c7245cb4ea3787784582cea667888cf1815
+ 3.4 en [eventconfiglogcreated,core]