Modularize "related objects" menu items in Maniphest
Summary:
Ref T11179. This generates the Maniphest menu items in a modular way. It doesn't change any of the underlying code yet.
Searching for commits doesn't work particularly well so I've just hidden that for now, but the item itself works fine.
Test Plan: {F1696849}
Reviewers: chad
Reviewed By: chad
Maniphest Tasks: T11179
Differential Revision: https://secure.phabricator.com/D16162