More SIMPLE button styles for buttons and button bars
Summary: Ref T1460, this adds additional buttons colors and styles for use in inline comments. Will also backport to Calendar and PHUIInfoView
Review new buttons and hover states in UI Examples.
Reviewers: btrahan, epriestley
Reviewed By: epriestley
Subscribers: Korvin, epriestley
Maniphest Tasks: T1460
Differential Revision: https://secure.phabricator.com/D12162