Added a class for handling mutilple IMU's not done yet.
Merge branch 'master' of github.com:jchillerup/rokoko

# By Jens Christian Hillerup
# Via Jens Christian Hillerup
* 'master' of github.com:jchillerup/rokoko:
  fused the compactImuClient with some SPI slave code found online
  make it compile