R1:c2a70932e32a

MetaMTA: Owners, Pholio, Macro

Summary:
Port MetaMTA options for Owners, Pholio and Macro.

At some point I'd like to get rid of all these options (provide one "reply domain", and not allow overrides of reply handlers -- use events instead) but that's a battle we can fight later.

Test Plan: Looked at options, looked at setup issues, edited something.

Reviewers: codeblock, btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T2255

Differential Revision: https://secure.phabricator.com/D4469