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

STUD-1754

STUD-1658

This commit implements STUD-1490, allowing creation of components
on the container page. It also enables the delete and duplicate
buttons now that new content can be created that would benefit.

Note that it also creates shared functionality for adding components,
and refactors the unit page to use it too.