This is now a working version of a desktop transmission program; it can't yet receive data. The code
is more than a little ugly, though, so it's not done by any means, it's just that it works.
Previously, all invocations with `-f`, to give a file as input, would default to streaming. Now,
though, it will try to statically turn it into a qr code, and failing that, will stream it as raptor
packets.
