Update Macro for Modular Transactions

Summary: Overall, seems to work ok.

Test Plan:

• Add a Macro
• Edit Macro
• Use Macro
• Disable Macro
• Re-enable Macro
• Attach Audio
• Set Audio to loop
• Annoy cats

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Differential Revision: https://secure.phabricator.com/D17813