[cryptolib] generalize PRF definitions, PRP<->PRF#1028
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This takes a swipe at cleaning up the PRF and PRP theories, as well as the associated switching lemmas. This should bring them more in line with modern EasyCrypt practice while also making them better examples of modern EasyCrypt development themselves—perhaps serving as advanced tutorials.
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This generalises the definition of PRFs to not require keygen to sample from a distribution, and to not require a deterministic PRF. This (standard but relatively) specialist definition can be recovered when instantiating with a concrete PRF.
This is a breaking change.