R1:ab7a0912126e

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…