R1:ee2680794f75

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…