invalidBase32, avoid 0xFF magic number
This keeps things fast by making the function inline, but also prevents people from having to know about the `0xFF` implementation detail directly, instead making one go through a `std::optional` (which could be fused away with a sufficiently smart compiler). Additionally, the base "nix32" implementation is moved to its own header file pair, as it is logically distinct and prior to the `Hash` data type. It would probably be nice to do this with all the hash format implementations.
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