Use XBlock version with more permissive DateTime field

Clean up unused parameter to JS render functions

Proofing UI in Studio Context

* making style rules simpler/universal for all step__actions
* proofing icon/copy of action are displayed inline together

Add missing semicolons

Will/js expansion

Set expand/collapse on load and reload.
Fix a bug where peer step would be reloaded too soon

Proofing UI in General and for LMS Context

Put save status in an h3 tag to preserve styling

Exclude migrations from test coverage

* proofing for specific LMS UI constraints
* proofing for poor LMS selector, styling, cascade work
* general markup/UI sync up
* aligning step-based icons different
* cleaning up small visual inconsistencies

Fix the Grade UI to only display the required number of reviews

Add turbo-mode to the peer assessment rendering.

adding in placeholder for step-based messages and styling/messaging specifically for turbo-mode

making peer turbo mode state collapse/expand friendly

compiling merge conflicted Sass

Fix broken test

Cleaning up the submissions graded view to just display the answer

Will/finish ui messages

Warn authors about changing a released problem.

Reword Studio warning message

Fixing the count problem on peer api, completed assessments.

Make start/end date fields store datetime objects internally

Add LmsCompatibilityMixin to OpenAssessmentBlock.

edx-platform expects certain things during the grade calculation
process. This adds a few fields and tests for that purpose.

[TIM-232]

Get scores by course_id and student_id