TNL-813

TNL-813

Move openassessment out of the apps directory
Use pkg_resources to check whether OA XBlock is installed.

Add UI styling for course staff, including collapse/expand.
Cache student item when retrieving submission and student item.
Protect against invalid cache key exceptions.
Update test suite to clear cache between tests.
Add composite index for AssessmentWorkflow student item fields

* 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

* better typography standards, choices, and consistency
* clearer colors - complete is separated from grade colors
* template class/markup syncing
* template copy updates
* adding new UI conventions - visual section and well elements
* adding a bit of flash in the pan - scale transitions to show active/focused sections

removing Font Awesome library from xblock base Sass/FED assets and downgrading any syntax references to match LMS's version of Font Awesome

TIM-227

* adding basic styling for rubric-based UI
* applying rubric-based UI styling to peer assessment
* adding oa-specific Sass extend partial
* basic template indentation cleanup
* adding initial JS for all collapsed/expanded UI to use
* refactoring small Sass bits

TIM-129

* adding in missing Font Awesome font assets
* correcting path for Open Sans typeface
* correcting typo in notes of openassessment IE-specific Sass
* syncing up variable names/values
* adding additional wrapper--grid element into layouts for easier grid-based styling
* syncing up variable names/values
* initial grid/view-based styles
* initial typographical styles

* import order - with base blocks, theming, and specific app layers
* base utilities/tools
* notes/starters for each Sass partial imported

TIM-127