Convert Vertical XModule to pure Vertical XBlock.

mattdrayer/SOL-461: Student dashboard clean-up

Remove timer_expiration_duration (leftover from Pearson proctored exams)

Fix two missing replacements of {studio_name}

Located in ```howitworks.html``` and ```import.html```.

Make LMS base gray AA compliant

Record durations of xblock views and handlers

Update course_publish event actions - Logged SOL-611 for follow up work 

Add John Espinosa to AUTHORS

Fix error when STUDIO_NAME uses non-ascii characters

Fix code comment showing in rendered page

Update translations (autogenerated message)

View discussion of user profile return 404

Added Myself To The Authors List

The replacement strings need to be unicode, so that when STUDIO_NAME contains non-ascii characters python can handle it correctly without raising exceptions.
Also, the value of STUDIO_SHORT_NAME can be read from cms.env.json.

Release

Override COURSE_*_VISIBILITY_PERMISSION from ENV_TOKENS

onload performance beacon for LMS pages

Fixed flaky test(s) - SOL-336 - merging updates

Consistently use display_name_with_default in Studio

update ORA2 to fix TNL-1758

Don't use the working tree as storage for test-created files.