R1:b482027687f2

Actual 2x avatar, new profile picture options

Summary: Provides a real 2x avatar and offers new built in images for profile pictures.

Test Plan: reload profile, see sharper image, pick eevee, see eevee

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Differential Revision: https://secure.phabricator.com/D14668