Author: Andrew Nicols
MDL-59392 calendar: Deprecate old event filters
http://git.moodle.org/gw?p=moodle.git;a=commit;h=7aaca085fb4de37d378add1f08b3d8b1ef61c291
http://github.com/moodle/moodle/commit/7aaca085fb4de37d378add1f08b3d8b1ef61c291
- 3.4 en [hidemoduleevents,core_calendar]