Finished hooking up new gyroscope.
Connected pitch output of gyroscope to AVR and gave pitch an output LPF.
Added optional HPFs to both pitch and yaw outputs. We can just leave the
pads empty if we think they won't be useful.
To route the changes, had to squeeze some other stuff. Moved the AVR
reset circuit up and to the left and flipped the gyroscope around. With
all of the filter elements, it's pretty crowded, but I think it will
I observe that ARM_WAKEUP is currently only connected to one pin (ERC
warning), but I haven't checked yet whether it was like that before.