toPlaceholderColor
fun MythicLineConfig.toPlaceholderColor(array: Array<String>, defaultValue: String = "FFFFFF"): (PlaceholderArgument) -> Int?
fun <T> MythicLineConfig.toPlaceholderColor(array: Array<String>, defaultValue: String = "FFFFFF", mapper: (Int?) -> T): (PlaceholderArgument) -> T