from

Turn the given hex string into a color.

If it is 8 characters long, it is assumed to be in the format #RRGGBBAA (alpha optional)
If there is a leading #, it will be removed.
If it is 1 character long, the character is repeated e.g. #f ->#ffffff
If it is 2 characters long, the character is repeated e.g. #0f ->#0f0f0f
If it is 3 characters long, the character is repeated e.g. #0fe ->#00ffee

if the hex string is not in a valid format

if the hex string is not a valid hex string

fun from(hex: String, alpha: Int = 255): PolyColor

fun from(hex: String, alpha: Float = 1.0f): PolyColor