Pgen

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Upgrades rand to version 0.9.0. This required only minimal changes to use statements and the methods called.

I don't think anything functionally changes here, though I will note that the good folks who maintain rand posted a security disclaimer of sorts along with v0.9.0.

FWIW, for my passphrase generator, Phraze, I'm considering being more explicit in creating my pseudo-random number generator (see this PR) just to be on (what I think is) the safe side of things. Curious what you think.