Remove test_video_player_a11y test

Define xss-linter rules on linter classes

Add search for courses API to allow building a mobile native search view

add entitlement creation and reissue to support

Remove tests that are flaky with firefox 59

add missing maintenance banner settings

Learner-3925

Use updated packages to avoid installing unwanted stuff

Include created datetime in entitlement support detail serializer

Upgrading edx-enterprise to 0.66.1.

https://github.com/edx/edx-enterprise/compare/0.66.0...0.66.1

Delete some unused settings

Move support actions to existing entitlement api

Initially introduced here:
  https://github.com/edx/edx-platform/commit/e0aa8cf78a1dc342ed4e00082768fb0a400a585f#diff-8a23909bc8d201fba8525b1dd6396247

Rendered irrelevant here:
  https://github.com/edx/configuration/commit/ece0ea00e9aacb1c1243b65fc1c16c7e7d815b23

Footer Design Implementation without using bootstrap WIP

Remove tests that fail on firefox 59

The New footer design implementation without using bootstrap. Using flexbox
creating new classes to assign different widths in different screen breakpoints.

LEARNER-2312