This reverts commit 67177ac7.

The original PR cause a breakage on production due to webpack building two different
copies of the asset_index.js bundle. However, it is unclear whether that was a
transitory issue or not. This commit restores the original PR to validate whether
the problem is reproducible.

This reverts commit 1c46bd89, reversing
changes made to eb6064e3.

This reverts commit 4946b6b2.

* Implement a ViewedEvent handling system which calls handlers when a
  block has been viewed for 5 seconds (configurable).
* Hook up Verticals to register their children blocks with this event,
  and submit completions once seen.

OSPR-2093
OC-3358

update styles

html updates

add waffle flags

fix waffle flags

Running LMS Karma tests was causing the following error:

  TypeError: modules[moduleId] is undefined
  at /edx/app/edxapp/edx-platform/lms/static/course_experience/js/spec/Enrollment_spec.js:20

The root issue was sinon, as documented here:
  https://github.com/webpack/webpack/issues/304

I tried multiple fixes suggested from that issue until I found one that
worked: https://github.com/webpack/webpack/issues/304#issuecomment-272150177

update css

updated css

make modal experimental

add waffle flag

Add the back-end and front-end React app for Learner Analytics.
This was mostly authored by @AlasdairSwan and @dianakhuang.

LEARNER-3376

wip

upsell modal css

remove unnecessary newline

accidentally removed feature

update props

update modal component

update css

add additional slides

update styling

update copy

LEARNER-3438

The user can now enroll in a session, unenroll from a session or change session
from a new course enrollment card on the programs dashboard.

Increase the number of bundles that a chunk has to appear in to be put
into the commons.js bundle. This drastically reduces the size of the
commons.js bundle (used basically everywhere on LMS and Studio) from
953K to 188K, mostly at the cost of making AccessibilityPage and
AssetsPage (both Studio-only) larger -- 345K -> 1.1M, 91K -> 865K.

[FEDX-453]

[extreme wip] mako/react bridge code [FEDX-453]

more attempts

split out entry points into separate file

this works!

kill dynamic import

error handling

didn't need webpack_static

handle passing props

cleanup django-template-rendering defs

pytest monkeypatch fix

cleanup

add id arg to renderReact def

more cleanup

oops

quality xss fixes

unittest fix

kill HelloWorld

EDUCATOR-1448

Modifies paver webpack task to use production configuration in all
non-devstack environments, and a development config in devstack.

LEARNER-2804

LEARNER-2412

LEARNER-2307

FEDX-375

EDUCATOR-625, AC-620

LEARNER-1652

We now send log events when the user clicks on the events in the course
toolbar, representing a change to the new page.

LEARNER-1628

This allows enrolled users to write reviews on the reviews page that
can be accessed through the course tools sidebar. A button in the top
corner of the page toggles the widget that is configured with a
setting in the common.py file. The reviews tool is Course Talk.

EDUCATOR-823

Updated confinguration of webpack and translation tools to work with jsx files

EDUCATOR-823

changes to webpack config

Fixed space issue

Adding a reviews page to the course and updating the reviews module on the course about page. Removed the existing coursetalk implementation and put it in a fragment, removed the tests as well. Added configuration settings to specify the reviews template as well as the reviews provider. This is all protected by a waffle flag.

This lets us consolidate chunks of JavaScript that are common to
multiple bundles, so that they can live in their own shared file. This
will be more relevant when we have UI components -- there's actually
very little shared code right now.