R1:0204489a5265

Modularize workboard column transactions

Summary: Depends on D20279. Ref T5474. Modernize these transactions before I add a new "TriggerTransaction" for setting triggers.

Test Plan: Created a column. Edited a column name and point limit. Hid and un-hid a column. Grepped for removed symbols.

Reviewers: amckinley

Reviewed By: amckinley

Maniphest Tasks: T5474

Differential Revision: https://secure.phabricator.com/D20286