7674 - beginning of mouse driver

No handler yet, just initialization.

Bochs boots up; Qemu gets into a reboot loop.

Unlike the keyboard where I did the minimum necessary for Qemu, here I
am blindly copying something alleged to work on "real hardware." Makes
no difference to the failure modes I'm seeing.

Even in this tiny endeavor I see the abyss open up. Poke bytes at some
sequence of ports, read back bytes from some sequence ports; it's like
sending out prayers.

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