MDL-48947 course: Section button cleanup

Creates a new method of handling all the section related icons.
Including a new method that places these actions in a menu for topic and
weeks course formats. (This version replaces "Edit" with "Topic/Week/or
Section menu")

course/lib.php

@@ -3322,6 +3322,8 @@ function include_course_ajax($course, $usedmodules = array(), $enabledmodules =
             'edittitleinstructions',
             'show',
             'hide',
+            'highlight',
+            'highlightoff',
             'groupsnone',
             'groupsvisible',
             'groupsseparate',