Author: Shamim Rezaie
MDL-68076 core: log user's click on feedback links
http://git.moodle.org/gw?p=moodle.git;a=commit;h=363aaf6eaa9d513ee642f4883c18e530ee016191
http://github.com/moodle/moodle/commit/363aaf6eaa9d513ee642f4883c18e530ee016191
+ 3.9 en [eventuserfeedbackgiven,core]
+ 3.9 en [eventuserfeedbackremind,core]