Remove obscure features no longer supported by Toolsets from "classic" Arcanist

Summary: Depends on D21004. Ref T13490. The "wilds" branch removed a bunch of dead features but some of them were resurrected by the merge. I don't think any of these are desirable to retain, so purge them all again, even in classic mode.

Test Plan: Grepped for affected symbols.

Maniphest Tasks: T13490

Differential Revision: https://secure.phabricator.com/D21005