R1:be785d1e8ab6

Add some pre-built alphanumeric characters

Summary: Ref T10319. Builds out some decent looking letters and numbers.

Test Plan: Review alignment in Photoshop.

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Maniphest Tasks: T10319

Differential Revision: https://secure.phabricator.com/D17417