fix Fatal error: Call-time pass-by-reference has been removed

Signed-off-by:Eric Villard <dev@eviweb.fr>
Moodle.2x mod/taskchain allow pasting of answers if window.allow_paste_input = true
Moodle.2x mod/taskchain remove select effect when dragging in JMatch and JMix
Moodle.2x mod/taskchain improve performance of Rhubarb STOP button
Moodle.2x mod/taskchain fix Fatal error: Call-time pass-by-reference in 'mod/taskchain/attempt/review.php' - thanks to eviweb
Merge pull request #5 from eviweb/fix-pass-by-reference

fix Fatal error: Call-time pass-by-reference has been removed
Moodle.2x mod/taskchain correctly set, display and retrieve the stop button settings