R1:9b27b5c7dab3

Convert "Display Preferences" to modular settings

Summary: Ref T4103. Just porting these directly for now, no attempt to organize things yet.

Test Plan: {F1669263}

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T4103

Differential Revision: https://secure.phabricator.com/D15997