Generate random strings.
These are the exported function signatures:
func PickLetter() rune
func PickVowel() rune
func PickCons() rune
func Seed()
func String(length int) string
func EnglishFrequencyString(length int) string
func HumanFriendlyString(length int) string
func CookieFriendlyString(length int) string
func HumanFriendlyEnglishString(length int) string