First cut of progress bars (PHUISegmentBarView)
Summary:
Ref T10288.
I couldn't figure out how to reasonably get the interior right borders to round like the mock, but I think this is otherwise mostly faithful. Feel free to fix stuff.
Test Plan:
Reviewers: chad
Reviewed By: chad
Maniphest Tasks: T10288
Differential Revision: https://secure.phabricator.com/D15219