Provide convenience method addTextCrumb() to PhabricatorCrumbsView

Summary: We currently have a lot of calls to addCrumb(id(new PhabricatorCrumbView())->...) which can be expressed much more simply with a convenience method. Nearly all crumbs are only textual.

Test Plan:

• This was mostly automated, then I cleaned up a few unusual sites manually.
• Bunch of grep / randomly clicking around.

Reviewers: btrahan, chad

Reviewed By: btrahan

CC: hach-que, aran

Differential Revision: https://secure.phabricator.com/D7787