[Coco] Drivewire development

[James Jones]

I grabbed the Java source and took a look at revising it to take advantage
of streams (after all, Java 8 has been around for quite a while) and some
other stray changes. I haven't tried it out yet.

I'm going through the spec to make sure I understand it. One impediment: it
looks like the end of the description of the WRITE transaction got chopped
off. (What is it that the CoCo might send on CRC error?) My goal is to
implement, ideally based just on the spec, a DW4 server written in Go, with
an eye towards simplicity and clarity.