Add a few glyphs

Copied from Jeff2501's snis_rework, this commit:
https://github.com/JeffM2501/snis_rework/commit/d6d04c1735f1d72970323c1513f1d7d0d5720b20
Improve a few glyphs that looked a bit weird
fix '@' glyph
Fix Odd looking fonts

from
https://github.com/smcameron/space-nerds-in-space/commit/f4e2a9d4e80e096f12ee2de4154f7576b7783f2b
and

https://github.com/smcameron/space-nerds-in-space/commit/95a8f60ed92e6583dd57b4bcd5258ab0595fab68
Make % not so tall