TIM-337: Feedback on assessment UI

Adding start date validation to assessment modules

Sylvia/ora2/tim 384

Acknowledge Submission Deadline

* provides static states for submission cases
* adds in abstracted system-feedback sass partial
* adds in starter animation sass partial
* syncs up loading style for steps with standards
* moves message UI archetypes/variables to the xblock level of Sass architecture

Move JS grade step into a separate file
Feedback on submission UI wiring

TIM-304

Move JavaScript response step code into separate view class.
Implement unsaved draft and save button enable/disable

Update turbo mode to only be open after submission deadline

TIM-346: Server-and-client-side size validation

update authors file

Merge branch 'jrbl/tim-346-check-input-sizes' of https://github.com/edx/edx-ora2 into jrbl/tim-346-check-input-sizes

Updating error text for overlong inputs from "Text is too long." to
"Response text is too large. Please reduce the size of your response and
try to submit again."

Fix the checks in the migration script, and fix a mistaken tweak in the ...

Javascript validation keeps inputs < 64KB, the python API allows up to
100KB.

Inputs in any user-editable text box that are too large will be rejected
without an AJAX call.

Inputs delivered via Python to the API which are too large will be
rejected with an approriate API error.

TODO:
 * @talbs .message__content is styled very badly everywhere
 * Sizes are way too big, currently defaulting to 1MB for API and 256KB
   for js
 * Sizes are configured in too many places, when they should come in via
   settings or something

Studio JS cleanup

Assessment Feedback Form Styling

FIX - text-shadow Property on Buttons

TIM-336

UI Clean Up - Rubric Questions in Grade Report

WIP: Updating the query to be simpler

* simplifies self-assessment visual differentiator
* changes grid for larger screens to show 3 answers per row (to keep visual lines scannable)
* adds polish to ui-hint elements

Studio save errors display in the UI.

Turbo Waiting Template