- Doubled up :hover and :focus styling to improve a11y
- Increase contrast of certain UI elements for improved a11y
- Added some image alt text for a11y
- Changed video caption styling to blue and made them underline on hover and added a skip link before video for screenreaders.

Fixes Bugs:
- LMS-1336

[LMS-57]

set max enrollment for downloads to 200

set max enrollment for downloads to 200

Defined baseUrl in the legacy instructor dashboard template, fixing a bug where the HTML editor would fail to load

This required changing structural XModules to fully implement
student_view, rather than just returning the HTML of their children in a
get_html call.

[LMS-223]
[LMS-1170]

LMS: adds message styling to the separate instructor_2 Sass file

set max enrollment for downloads to 200

course_about was throwing 500s if ENABLE_SHOPPING_CART=False

With tests, some settings changes
(all should default to not breaking anything for edx)

Added styling for shopping cart User Experience
- Styled shoppingcart list page
- Styled navigation shopping cart button
- Styled receipt page
- Styled course about page for shopping cart courses

Addressed HTML/SCSS issues

Remove offending body class and unnecessary sass changes

Addresses many review comments on stanford shopping cart

* framework for generating order instructions on receipt page
  in shoppingcart.models
* move user_cart_has_item into shoppingcart.models
* move min_course_price_for_currency into course_modes.models
* remove auto activation on purchase
* 2-space indents in templates
* etc

revert indentation on navigation.html for ease of review

pep8 pylint

move logging/error handling from shoppingcart view to model

Addressing @dave changes

This is a recurrent ops problem, so we wanted to make it available
on the instructor dashboard.

Hide show_timezone from Advanced Settings and migrate courses with show_timezone=False to using due_date_display_format.

STUD-724

Test course for allowing custom formatting of due date strings.

STUD-724

Try making the name of the course match the folder name.

More cleanup.

More cleanup.

updates.

* Uses override_settings to provide test variable
* Move location of cms link to upper right
* PEP8 / Pylink

A one-click way of getting to editing the course

Switch to using decorators; refactor and cleanup tests.

 Delay for possible race condition with fetching course email object.
 Use settings.SITE_NAME for host name to generate email footer url.

Adds a new Email link to the instructor dashboard for frontend interface to send
email to course members. Adds a feature flag ENABLE_INSTRUCTOR_EMAIL to toggle this.
Creates a new djangoapp bulk_email that handles this action by getting the recipient
list and batching the emails to different celery tasks to do the actual sending.
Requires lynx package to convert HTML email to plaintext. Handles SMTP errors by
retrying or falling through to the next email. Adds the option to opt out of course
specific emails in the user dashboard with an Email Settings link for each course.
Uses severable configurable settings with defaults. DEFAULT_BULK_FROM_EMAIL
specifies the from address for email. EMAILS_PER_TASK specifies the number of emails
each celery task takes on. EMAIL_HOST, EMAIL_PORT, EMAIL_HOST_USER,
EMAIL_HOST_PASSWORD, and EMAIL_USE_TLS for the SMTP email backend settings.

Co-authored-by: Akshay Jagadeesh <akjags@gmail.com>