R1:352c36f0abbd

Tighten up fonts in Conpherence.

Summary: Minor tweaks to font size, message pane spacing.

Test Plan: use more common spacing (4px grid)

Reviewers: epriestley, btrahan

Reviewed By: btrahan

Subscribers: Korvin, epriestley

Differential Revision: https://secure.phabricator.com/D11583