split measure & report, work on fuel, add meter

Split measure & report from update: updates are processed as fast as
possible, but reports are sent on a cadence (allows inter-reported
measurements to be averaged easily)
Added debugMode. It's always on right now.
Added MultiMeter to handle electrical calculation stuff. It's only got
one thing right now.
Worked on Fuel measurement some. Not sure if the calcs will work yet.