Move "wild" config types to new code
Ref T12845. This is the last of the hard-coded types.
These are mostly used for values which users don't directly edit, so it's largely OK that they aren't carefully validated. In some cases, it would be good to introduce a separate validator eventually.
Test Plan: Edited, deleted and mangled these values via the web UI and CLI.
Reviewers: chad, amckinley
Reviewed By: amckinley
Maniphest Tasks: T12845
Differential Revision: https://secure.phabricator.com/D18164