Color palettes

[gorkang]

Should come back to see how we can improve the color palettes for PPV and NPV.

A few different goals:

• Improve clarity and differentiation between natural thresholds (25, 50, 75%)
• Make sure the palettes are OK for colorblind people
• Add ability to choose from different palettes

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Example code of palettes attempts:

    # https://www.google.com/search?q=color+picker
    if (PPV_NPV == "PPV") {
      # Paleta_DV = c("white", "grey", "gray30", "yellowgreen", "chartreuse4") #Original
      # # Paleta_DV = c("#ffffff", "#777777", "#464646", "#9ACD32", "#458B00") #Hex names
      Paleta_DV = c("white", "grey", "1b2610", "yellowgreen", "chartreuse4") #Original
      
      # Paleta_DV = c("#ffffff", "#666666", "#1b2610", "#9ACD32", "#458B00") # More contrast greys
    } else if (PPV_NPV == "NPV") {
      # Paleta_DV = c("white", "grey", "gray30", "yellowgreen", "chartreuse4")
      # Paleta_DV = c("#ffffff", "#777777", "#464646", "#ff8e47", "#cc4e00") # Orange
      # Paleta_DV = c("#ffffff", "#777777", "#464646","#b66afc", "#420080") # Violet
      Paleta_DV = c("#ffffff", "grey", "#190d24","#bd7afa", "#420080") # Violet
    }