automatically pull oof for best parameters if savePredictions = TRUE

[tmastny]

Here is the idea:

  # I show just automatically pull best parameters
  # selectedIndices <- rfFit$pred$mtry == 2
  # # Plot:
  # plot.roc(rfFit$pred$obs[selectedIndices],
  #          rfFit$pred$M[selectedIndices])

[tmastny]

There is the issue of having an unknown number of columns (tuning parameters) to filter. I found one solution here: https://stackoverflow.com/a/38880517/6637133

But I would like a modern tidyeval/quosure solution. Not sure how.