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