WIP: also accepting fonts "in-memory" via ByteIO objects
WIP: also accepting fonts "in-memory" via ByteIO objects

(issue #1121)

graphicore/fontbakery,graphicore/fontbakery,googlefonts/fontbakery,moyogo/fontbakery,googlefonts/fontbakery,moyogo/fontbakery,graphicore/fontbakery,moyogo/fontbakery,googlefonts/fontbakery