mastic: Use empty seeds instead of zero seeds #1196
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Stacked on #1195.
Partially addresses #947.
See jimouris/draft-mouris-cfrg-mastic#106.
To allow using empty seeds, we hardcode the XOF to
XofTurboShake128. We also considered API changes to accommodate different instantiations of the XOF, but opted to hardcode in order to nudge users towards the standardized variant. Note that this also means that Mastic requires the "crypto-dependencies" feature.