R1:268fac25d544

Add Phurl Remarkup

Summary: Ref T9722, Add Phurl Remarkup as `((id))` or `((alias))`

Test Plan: Add a comment to any object as `((id))` or `((alias))`. Make sure comment renders as a link.

Reviewers: epriestley, #blessed_reviewers

Reviewed By: epriestley, #blessed_reviewers

Subscribers: Korvin

Maniphest Tasks: T9722

Differential Revision: https://secure.phabricator.com/D14427