Allow macros to have associated audio and audio behaviors

Summary: Ref T3887. Implements storage and editors, but not the actual audio part.

Test Plan: Edited audio, audio behaviors of macros. Transactions and email looked good. Hit error cases.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T3887

Differential Revision: https://secure.phabricator.com/D7159