* prevent proctoring provider changes after course start

* better comment wording

* add support email to error msg

This will remove imports from __future__ that are no longer needed.

https://docs.python.org/3.5/library/2to3.html#2to3fixer-future

hide course card image, course about page image, and course
display name when publisher flag is turned on

Update version of edx-proctoring and update copy to refer to onboarding exams in Studio for proctoring backends that support onboarding exams.

do not show Create Zendesk Tickets For Suspicious Proctored Exam Attempts Studio Advanced Setting field if user is not edX staff

The course_visiblity field can have one of three values:
1. private (default): This keeps the standard access rules.
2. public_outline: Allows unenrolled and anonymous users access to the outline.
3. public: Allows unenrolled and anonymous users access to both outline and
   course content.

When an unenrolled user accesses course content, instead of student_view(),
public_view() is used. A default implementation is provided for XBlocks
which do not implement this view. The public_view() must not have any
functionality which assumes the presence of a valid User and should show
a readonly only interface for the XBlock content.

This reverts commit f9ae594d, reversing
changes made to 7c08e50f.

The course_visiblity field can have one of three values:
1. private (default): This keeps the standard access rules.
2. public_outline: Allows unenrolled and anonymous users access to the outline.
3. public: Allows unenrolled and anonymous users access to both outline and
   course content.

When an unenrolled user accesses course content, instead of student_view(),
public_view() is used. A default implementation is provided for XBlocks
which do not implement this view. The public_view() must not have any
functionality which assumes the presence of a valid User and should show
a readonly only interface for the XBlock content.

and fixes affected tests.

Summary: We show "Issue Open Badges" setting in Studio
Course -> Settings -> Advanced Settings, even if the flag
ENABLE_OPENBADGES is set to False. With this commit, it
will only show up in Advanced Settings if ENABLE_OPENBADGES
is set to True.

Adds ENABLE_SUBSECTION_GRADES_SAVED feature flag to both lms and cms. Also
installs the wiring that will allow robust grades to be used for courses
that enable it. This functionality is still gated by the feature flag
and should not be used until the remaining robust grades work is finished.

TNL-4670

TNL-4366
Changes in studio to allow the hide_after_due setting to be utilized.

Includes:
    -python changes to contentstore, where the data is stored.
    -refactoring of timed-examination-preference-editor.underscore, to add this
        setting and make the editor more accessible.
    -javascript changes to link the new setting to the correct data model.
    -sass updates to fix a11y issues on the editor modal.
    -addition of post-due visibility information to course outline in studio.
    -new tests: python, js, acceptance, and a11y

TNL-4366
Changes in studio to allow the hide_after_due setting to be utilized.

Includes:
    -python changes to contentstore, where the data is stored.
    -refactoring of timed-examination-preference-editor.underscore, to add this
        setting and make the editor more accessible.
    -javascript changes to link the new setting to the correct data model.
    -sass updates to fix a11y issues on the editor modal.
    -addition of post-due visibility information to course outline in studio.
    -new tests: python, js, acceptance, and a11y

It doesn't make sense to list these LMS block attributes in course-level advanced settings. Doing so is confusing to course teams.

It doesn't make sense to list these LMS block attributes in course-level advanced settings. Doing so is confusing to course teams.

 The CCXCon app is used to push course updated to the CCXCon
 externale service.

- added the new field review_rules for software secure
- added a new tab name "Additional Settings" for the proctored/timed exams

fixed object has no attribute 'get'

fixed 'LazySettings' object has no attribute

add social settings to cms/env/aws

* updated the flags for social media sharing
* added facebook feed ui to share public url
* update the condition logic
* update the code as per suggestion and added pick new style for share buttons
* update the css class reference
* update the bok-choy test
* updated description and some text touch-ups
* moved the JS related to facebook into separate location
* js formatting
* Add trailing comma per chrisndodge
* Add wait to fix flaky test...maybe

ECOM-1591