Remove edx-icons from edx-platform - TNL-4813
Remove edx-icons from LMS - TNL-4952
comment out baseline screenshot Bokchoy assertion tests
SOL-1937 Temporarily comment out baseline screenshot Bokchoy assertion tests

Also reconfigured paver to compile Sass into CSS directories

This allows course authors to choose between two difference licenses for their
course content: All Rights Reserved, or Creative Commons. In the backend, XBlocks
that wish to allow custom licenses need only inherit from LicenseMixin, which
adds a `license` field as a string.

License information is displayed in the Studio editor view, and just below the
rendered XBlock in the LMS. In addition, if the course block itself has a custom
license set, this license will display just below the main body of the page
on courseware pages.

This entire feature is gated behind the LICENSING feature flag.

* updating vendor files
* updating class syntax (to new FA-based classes) for all UI elements
* correcting broken tests

TNL-395