create_png: Creates a PNG file graphic of a scorecard data frame.
In greatgray/scorecard: GGCM Model Performance Scorecard

Creates a PNG file graphic of a scorecard data frame.

create_png(df, scorecard_dir = stop("Pass scorecard directory"), name = "",
  title = "", file_date = lubridate::today(), highlight_rank = TRUE,
  fill_activated = "#1ec322", fg_activated = "black",
  fill_candidate = "#fedd32", fg_candidate = "black",
  fill_deactivated = "#fd696a", fg_deactivated = "black",
  fill_retired = "#6496fc", fg_retired = "white", fill_rank = "#1ec322",
  fg_rank = "black")

`df`	scorecard data frame, as from `scorecard_produce`
`scorecard_dir`	directory destination for file write
`name`	file name body; the function will paste together the `file_date`, an underscore, and the `name` with the `.png` extension to create the complete file name. The `file_date` is used to facilitate directory sorting.
`title`	a title appearing above the table, default empty
`file_date`	a date stamp for the destination file
`highlight_rank`	whether to highlight rank 1 fields
`fill_activated`	fill color for activated model cell
`fg_activated`	foreground color for activated model cell
`fill_candidate`	fill color for candidate model cell
`fg_candidate`	foreground color for candidate model cell
`fill_deactivated`	fill color for deactivated model cell
`fg_deactivated`	foreground color for deactivated model cell
`fill_retired`	fill color for retired model cell
`fg_retired`	foreground color for retired model cell
`fill_rank`	fill color for rank one outcome cells
`fg_rank`	foreground color for rank out outcome cells