refactor: no need for clever byte_parser property
refactor: no need for clever byte_parser property

It was only ever used once per object, so just make the ByteParser when
we need it.

hugovk/coveragepy,hugovk/coveragepy,nedbat/coveragepy,nedbat/coveragepy,hugovk/coveragepy,nedbat/coveragepy,hugovk/coveragepy,hugovk/coveragepy,nedbat/coveragepy,nedbat/coveragepy