Move "wild" config types to new code

Summary:
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