BHI160 Implementation

Create a supporting task in FreeRTOS that reads from BHI160's FIFOs. The data that is gathered this way should be stored and made available via the Epicardium API in some way.

Considerations need to be made regarding low-power mode, which means turning sensors off/on or only reading the wakeup fifo in low-power mode.

It would also be cool if the activity detection features could be used to wake card10 up from sleep.