* Remove legacy USE_SERIAL define * tidy up missed comments
Co-authored-by: Drashna Jaelre <drashna@live.com> Co-authored-by: Joel Challis <git@zvecr.com> Co-authored-by: Ryan <fauxpark@gmail.com> Co-authored-by: James Young <18669334+noroadsleft@users.noreply.github.com>