Recognize "#project" as a formal object name

Summary: Ref T4264. Ref T4262. Ref T2628. Ref T3190. To write Herald object rules which bind to a project, I want to take the low budget approach and have the user just type #project into a text field. Formally recognize #project as an object name, by moving all the existing stuff from the remarkup rule to the PHID type declaration.

Test Plan: Typed #project into jump nav and phid.lookup in Conduit. Typed #project into Remarkup.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T3190, T4264, T2628, T4262

Differential Revision: https://secure.phabricator.com/D7882