Hard-coded scroll wheel

[pete]

I was having issues disabling the middle-click scrolling; tweaking it with xinput wasn't helping. The culprit appears to be this change: b1370d2#diff-6a64a8236fdb7655791ce8d948be62f378eab800dffa3958b7ee26bfea2b79d1R31-R34 . I am using some software (p9p acme, drawterm, Inferno) that actually doesn't function properly if holding middle-click forces scrolling, so I wanted to map a button to toggle it in my window manager.

Since it's possible to do in software (something like xinput --set-prop 'ClockworkPI DevTerm Mouse' 'libinput Button Scrolling Button' 2), it's probably better to leave this out of the firmware. If it's in the firmware, it can't be disabled in software.

[pete]

I did manage to verify that it works if I reflash to the 0.1 firmware. (Though ttyACM0 was hard-coded, so I had to fiddle with it a while to make it point at ttyACM1; a different board was eating the ttyACM0 slot.)