Move server-related Aphlict options to a configuration file

Summary: Ref T10697. This isn't everything but starts generalizing options and moving us toward a cluster-ready state of affairs.

Test Plan: Started server in various configurations, hit most (all?) of the error cases with bad configs, sent test notifications.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T10697

Differential Revision: https://secure.phabricator.com/D15701