Take out the trash

Merge branch 'datalogger'

I'm an idiot

Fix insanely obvious error in CAN interface VSS means GROUND, VDD means POWER

Diode-less battery RTC with external IC

First iteration of CAN datalogger using diode RTC

WIP datalogger

Merge pull request #5 from WURacing/can-sam CAN sensor data ingestion with AT SAM C21 E18A

moved some decoupling caps

Make ground plane better cover some analog inputs