Merge pull request #28 from commaai/power_monitoring

Added offroad power usage

Author: geohot

log.capnp

@@ -280,6 +280,7 @@ struct ThermalData {
   batteryVoltage @16 :Int32;
   usbOnline @12 :Bool;
   networkType @22 :NetworkType;
+  offroadPowerUsage @23 :UInt32;  # Power usage since going offroad in uWh
 
   fanSpeed @10 :UInt16;
   started @11 :Bool;