Data accuracy

Add a descriptor to the part to determine the data accuracy
Limit by an amount of bits, in the normal method of (2^X)-1
Make sure the amount of bits is available for access for referencing elsewhere

Reason for this change:
Cables and sensors can have innacuracies, so going to obscene decimal lengths over innacurate data is a waste of transmission time

An example

Battery
bits: 7
sign: False
value: 78