EDUCATOR-3149 (41aa1fd4)

EDUCATOR-3149

This reverts commit 105db2cf, reversing
changes made to 44745759.

This reverts commit 9a70ca78, reversing
changes made to efd5b9ab.

Hopefully fixes EDUCATOR-3053

Includes upgrade to Paragon and aria-live fixes.

This reverts commit 18d93b00.

Reapplies edx/edx-platform#17509

This reverts commit 0f7e2373.

Convert webpackified factories to es6 modules with global exports, and remove the invoke_page_factory pattern

file-loader just providing the file name and underscore printing it's
name instead of content.

LEARNER-4965

This basically commits the transpiled CoffeeScript JS (with minor
cleanup) and removes coffee build support.

A tiny amount of support for xblocks exists, because external users
may have xblocks with coffee. But no coffee in our tree anyway.

Also update studio-frontend to version 1.7.1

Adds a new React factory for that page to handle the logic. Also
cleans up the UI a little (centers it, stops using serif font, etc).

Open edit image modal via a custom signal

Send img tag attributes in open signal

Send natural image dimensions if no attr specified

Add new modal button in addition to old button

Also load built CSS when waffle switch on

Swap out TinyMCE toolbar button on waffle switch

Pass LANGUAGE_CODE from Django to template to studio-frontend

Define request.LANGUAGE_CODE in test_container_page.py

Learner-3925