percentage Chance
fun ValueGroup.percentageChance(name: String, default: Int, range: IntRange = 0..100, randomGetter: Supplier<out RandomGenerator> = DEFAULT_RANDOM): PercentageChance<Int>
fun ValueGroup.percentageChance(name: String, default: Float, range: ClosedFloatingPointRange<Float> = 0f..100f, randomGetter: Supplier<out RandomGenerator> = DEFAULT_RANDOM): PercentageChance<Float>