Introduce helper for formatting PCR selection bitmasks #345
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This change introduces PCClientCompatible.PCRs(), a function that converts a variadic list of PCR indices (as ints) into a PCR selection bitmask. Because of the vagaries of TPM:
this change creates an interface that could be implemented for other TPM profiles that specify different amounts of PCRs. The vast majority of on-market TPMs will just work with PCClientCompatible.PCRs, even if they implement more than 24 PCRs.
PCRs() can panic if given invalid values; this is to allow it to be inlined into the definition of a structure that needs a PCR selection.