Generate some amount of PHP class documentation
Ref T988. This brings the class/interface atomizer over. A lot of parts of this are still varying degrees of very-rough, but most of the data ends up in approximatley the right place.
ALSO: PROGRESS BARS
Test Plan: See screenshots.
Reviewed By: btrahan
Maniphest Tasks: T988
Differential Revision: https://secure.phabricator.com/D6817