Summary: Ref T7756. Now viewing individual threads in Conpherence is `ZXXX` driven. Also adds remarkup support.
Test Plan: clicked around on list of conpherences in full view and it worked. selected 'view in conpherence' action from column and loaded correct `ZXXX` uri. Typed `ZXXX` in Maniphest and saw it link to Conpherence room.
Reviewers: epriestley
Reviewed By: epriestley
Subscribers: Korvin, epriestley
Maniphest Tasks: T7756
Differential Revision: https://secure.phabricator.com/D12397
