Methods to gracefully close content views, and use in playlist nav.
Don't try to close exercise_view if it doesn't exist on quiz.
Reliably suppress feedback on submit button in test and quiz modes.
Turn exercise answer button orange even when not logged in.
Fix bug where initial status message wasn't shown on exercises.
Properly pass context_id and context_type in for attemptlogs etc.
Merge branch 'fix_exercise_logging' into nalanda-rct2
Merge branch 'playlist_exercise_fixes' into nalanda-rct2