JSON Metrics files contain string values

[philipbaileynar]

The values in both the RSC and VBET metrics JSON files are being stored as strings instead of floats!

Here's a sample forn RSC metrics file:

{
  "catchmentLength": "36.841094665123165",
  "catchmentArea": "339.2",
  "catchmentPerimeter": "106.3255574338129",
  "circularityRatio": "0.3059197579201111",
  "elongationRatio": "0.4999141111458222",
  "formFactor": "0.2499141185227175",
  "catchmentRelief": "139.07495",
  "reliefRatio": "0.0037749950818789014",
  "drainageDensityPerennial": "0.09739809545990565",
  "drainageDensityIntermittent": "3.5110341741155597",
  "drainageDensityEphemeral": "0.0",
  "drainageDensityAll": "3.6084322695754656"
}