MDL-43312 TinyMCE: Version bump to 3.5.10. Remove all the hacks.

I retested the old bugs that required custom hacks to tinymce and could not reproduce them,
so I have not reimplemented the hacks.
MDL-45304 events: Triggering event course module update actions.
Merge branch 'MDL-45304-26' of git://github.com/lameze/moodle into MOODLE_26_STABLE
Merge branch 'MDL-43312-26' of git://github.com/damyon/moodle into MOODLE_26_STABLE
MDL-43312 tinymce: bump plugin version
MDL-45414 wiki: blank image for page index icons
MDL-45332 repository_url: URL parameter is using PARAM_URL
MDL-44262 Behat: Bump behat version to get format fix
Merge branch 'wip-mdl-44262-m26' of https://github.com/rajeshtaneja/moodle into MOODLE_26_STABLE