Summary: Ref T8099, Moves AphrontPagerView to PHUIPagerView, converts to standard PHUIButtons and adds some additional features for icon placement on buttons.
Test Plan: Tested Advanced Search and Searching files in Diffusion. Works as expected.
Reviewers: btrahan, epriestley
Reviewed By: epriestley
Subscribers: Korvin, epriestley
Maniphest Tasks: T8342, T8099
Differential Revision: https://secure.phabricator.com/D13092
