Returns the passed string coloured with an IRC colour depending on the hash
of the string, making for good "random" (uniformly distributed) nick colours
in IRC messages.
stringircColourByHash(string word, Flag!"extendedOutgoingColours" extendedOutgoingColours)
Returns the passed string coloured with an IRC colour depending on the hash of the string, making for good "random" (uniformly distributed) nick colours in IRC messages.