Removes most remaining hardcoded references to XSeries from the LMS. Part of ECOM-4638.

This work removes most references to XSeries from the LMS in an attempt to be more general. ECOM-5018.

TNL-4622

ECOM-3199

Resolves conflicts between reverts of pattern library test pages and multi-site comprehensive theming, and the re-introduction of pattern library test pages. Fixes a pipeline rendering test which relied on other tests updating assets. The test now ensures that static assets are available before running.

FEDX-93

These are developer only pages, so can not be seen in production
environment. On devstack, you can access these pages in LMS and
Studio at:

    /template/ux/reference/pattern-library-test.html

This is the second attempt to enable the Pattern Library. The
first attempt broke Django Templates and didn't work correctly
with right-to-left styling.

This reverts commit 845e3708.

This reverts commit 845e3708.

FEDX-93

These are developer only pages, so can not be seen in production
environment. On devstack, you can access these pages in LMS and
Studio at:

    /template/ux/reference/pattern-library-test.html

ECOM-3940

This will allow users to delegate permissions to a 3rd party service.

TNL-1958

Page skeleton and endpoint to submit FA requests to Zendesk.

ECOM-2824
ECOM-3038

Discussion forum styling cleanup to correct current visual styling issues in addition to cleaning up styles in preparation  for adding post images

* Add new role for support staff.
* Move dashboard/support functionality into a new Django app called "support".
* Add support view for searching and regenerating certificates.
* Refactor certificates views into separate files.

Also reconfigured paver to compile Sass into CSS directories

Serve branded footer JSON/HTML/CSS/JS from an API endpoint
in the branding app.  Refactor OpenEdX and EdX.org footer templates
to use the Python version of the API, ensuring that the API
values are consistent with the footer included in main.html.

Detailed changes:

* Added footer API end-point to the branding app.
* Footer API allows the language to be set with querystring parameters.
* Footer API allows showing/hiding of the OpenEdX logo using querystring parameters.
* Deprecate ENABLE_FOOTER_V3 in favor of the branding API configuration flag.
* Move no referrer script into main.html from the edx footer template.
* Rename rwd_header_footer.js to rwd_header.js
* Cache API responses.

Authors:
Awais Qureshi, Aamir Khan, Will Daly

ECOM-1547 created new template and Sass file for new footer. Wrapped it in a feature flag and updated previously named footer-edx-new.html to footer-edx-v2.html to better track/name updates to the footer going forward.
ECOM-1547 removed data-updated attributes from body
ECOM-1548 added JS file that inits analytics event listener and makes ajax call to API to get footer and HTML and add it to the DOM
ECOM-1547 code review cleanup
ECOM-1547 rebase and Sass appraoch update after @talbs the IE9 killer slayed the mighty beast.
ECOM-1547 updated file names and added comments in light of @talbs review of PR
ECOM-1547 update to social media link styles and nav link order
ECOM-1547 updated SOCIAL_MEDIA_FOOTER_NAMES if ENABLE_FOOTER_V3 is true
ECOM-1547 added translations to screenreader text
ECOM-1547 fixed test and renamed files in line with @talbs's pending PR
ECOM-1547 cleaned up file naming

TNL-1499