- Add status LEDs and RGB WS2812
- Move IMU control lines to STM and move it closer to board edge for
  better space efficiency
- Finalize footprints and BOM part references
- Merge SWD and UART to free some space, in reset UART can't be active
  anyways
- Finalize INx pin placement (move away from TIM1x those aren't
  supported by libopencm3) and refine MC assignment (all on same
  timer)

handy for checking if schematic changes are because Kicad doesn't sort
it's output files or if some connection somewhere actually changed.