* [ new ] Implement bit-rotation operators
Whereas `shiftR` and `shiftL` throw bits off the edge, the `rotR` and
`rotL` operations wrap the bits around to the start of the bit-stream.
* [ test ] visualise bit patterns instead
* [ fix ] print bit patterns the right way around
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Co-authored-by: Guillaume Allais <guillaume.allais@ens-lyon.org>
