Rename PhabricatorApplication subclasses
Summary: Ref T5655. Some discussion in D9839. Generally speaking, Phabricator{$name}Application is clearer than PhabricatorApplication{$name}.
Test Plan:
- Pinned and uninstalled some applications.
- Applied patch and performed migrations.
- Verified that the pinned applications were still pinned and that the uninstalled applications were still uninstalled.
- Performed a sanity check on the database contents.
Reviewers: btrahan, epriestley, #blessed_reviewers
Reviewed By: epriestley, #blessed_reviewers
Subscribers: hach-que, epriestley, Korvin
Maniphest Tasks: T5655
Differential Revision: https://secure.phabricator.com/D9982