Remove PhabricatorProject->loadProfile

Summary: Ref T603. Do modern, sensible queries here.

Test Plan: Viewed project profile, list, member edit, profile edit, used typeahead, changed project image.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T603

Differential Revision: https://secure.phabricator.com/D7252