This function scales the brightness of hex colors by a given factor.
     
    
    Usage
    scaleHex(hex, scaleFactor)
 
    
    Arguments
- hex
- Hex color values as characters. 
- scaleFactor
- A numeric value to scale the brightness.
A value of 1 returns the original color. 
 
    
    Value
    A hex color value with adjusted brightness.
     
    
    Examples
    scaleHex("#404040", 2)
#> [1] "#808080"