R1:78311f758d59

Make ignored setup issues grey

Summary: When I ignore setup issues, I want them to look dealt with, and keep yellow for new ones. Also updated callout colors.

Test Plan: Ignored a number of issues.

Reviewers: epriestley, btrahan

Reviewed By: epriestley

CC: aran, Korvin

Differential Revision: https://secure.phabricator.com/D6300