Experiment with making vector and bitvector distinct types

Only change that should be needed for 99.9% of uses is to change
vector('n, 'ord, bit) to bitvector('n, 'ord), and adding

$ifndef FEATURE_BITVECTOR_TYPE
type bitvector('n, dec) = vector('n, dec, bit)
$endif

for to support any Sail before this

Currently I have all C, Typechecking, and SMT tests passing, as well
as the RISC-V spec building OCaml and C completely unmodified.

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