Fix text-mode rendering of object and Asana link views
Summary:
Ref T2852. Two issues:
- Embeds (`T12`, `{T12}`) have some handle issues because handles run afoul of visibility checks under some configs. Make handles unconditionally visible.
- Asana links don't render correctly into text mode. Give them a valid text mode rendering so they don't flip out.
Test Plan: Made comments with `T12` and `http://app.asana.com/...` and published them to Asana.
Reviewers: btrahan
Reviewed By: btrahan
CC: aran
Maniphest Tasks: T2852
Differential Revision: https://secure.phabricator.com/D6696