message: fix unpackData bug when unpacking UNorm and SNorm data
diff: @@ -115,10 +115,10 @@ For normalised formats - :py:attr:`~renderdoc.CompType.UNorm` and :py:attr:`~ren
  # If the format needs post-processing such as normalisation, do that now
  if fmt.compType == rd.CompType.UNorm:
  - divisor = float((1 << fmt.compByteWidth) - 1)
  + divisor = float((2 ** (fmt.compByteWidth * 8)) - 1)
  value = tuple(float(i) / divisor for i in value)
  elif fmt.compType == rd.CompType.SNorm:
  - maxNeg = -(1 << (fmt.compByteWidth - 1))
  + maxNeg = -float((2 ** (fmt.compByteWidth * 8)) - 1) / 2
  divisor = float(-(maxNeg-1))
  value = tuple((float(i) if (i == maxNeg) else (float(i) / divisor)) for i in value)
  