[PD] A couple new list-abs

[Luke Iannini (pd)]

Here's another quick pair, again inspired by Python libraries (sorry,
Python just seems to love lists as much as Pd .39+ and I do), this
time the random module.

[list-sample n] grabs a random bunch of n unique items from the
incoming list and outputs them as a new list.

list-shuffle is a shortcut to [list-sample]ing the same number of
items as were in the list originally, which results in a shuffled
list.

Cheers
Luke
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