[Redesign] Better Headers, more options

Summary: Ref T8099, Adds ability to set header as "tall" and provide better control over height of actual header text. Also fixed some color issues with multiple object boxes.

Test Plan: Review a commit, review dashboards, review a diff, review home.

Reviewers: btrahan, epriestley

Reviewed By: epriestley

Subscribers: Korvin, epriestley

Maniphest Tasks: T8099

Differential Revision: https://secure.phabricator.com/D13077