Move most Herald actions and values into dynamic adapters
Summary: Ref T2769. Shift the bulk of value and action config into Adapters.
Test Plan: Viewed and edited Herald list and rules.
Reviewers: btrahan
Reviewed By: btrahan
CC: aran, vrana
Maniphest Tasks: T2769
Differential Revision: https://secure.phabricator.com/D6660