Include current mix ratios in M408 report

[makotosan]

I would like to be able to easily get the current mix ratios for all of the tools. It would be nice if this was part of the JSON output from M408. The only way that I could figure out from the documentation is to run M567 P* for each tool.
Maybe something like this as a JSON property:

mixRatios:[
  [0.00, 0.50, 0.50, 0.00],  // Tool 0
  [1.00, 0.00, 0.00, 0.00],  // Tool 1
  ...
]

My idea was to add a graphical way to view and change the mix ratios via the web control, but I didn't want to make a bunch of separate requests to get the ratio for each tool, and JSON from M408 is easier to parse than the text from M567 P0.

[dc42]

When I have added the mix ratio to the RRF object model, you will be able to retrieve them using the M408 P1 command with an appropriate F parameter.

[makotosan]

@dc42 Thanks!