* Fix type mismatches in track migrations
* Fix type mismatches in oauth_dispatch
* Fix type mismatches in badges migrations
* fix type mismatch in contentserver migrations
* Fix type mismatches in mobile_api migrations
* fix type mismatch in crawlers migrations
* fix type mismatch in dark_lang migrations
* fix type mismatch in branding migrations
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
