[Redesign] New Simple button style, remove unused button states

Summary: Mostly testing a more colorful simple button state, feels decent in use. Removed other simple colors and toggle buttons which I couldn't find any use of.

Test Plan:
Test workboards, inline comments, uiexamples, profiles, documentview

Reviewers: btrahan, epriestley

Reviewed By: epriestley

Subscribers: Korvin, epriestley

Differential Revision: https://secure.phabricator.com/D12882