R1:c878bf50339c

Update Macro for EditEngine

Summary: Updates Macro to use EditEngine. Also removes "URL" field for adding a Macro, which I think it's worth pursuing.

Test Plan:
- Create a Macro
- Forget to name it
- Try a PDF
- Use a Macro
- Edit a macro (not working)

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Differential Revision: https://secure.phabricator.com/D17821