Convert Nuance Items to Modular Transactions

Summary:
Ref T12738. Moves existing non-modular transactions to modular transactions.

Some of these are pretty flimsy, but a lot of them don't actually work or do anything in Nuance yet anyway.

Test Plan: Gently poked Nuance, nothing fell over.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T12738

Differential Revision: https://secure.phabricator.com/D17990