bbqueue

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It would be nice to use atomic types smaller than usize for tracking variables. This could be a significant size savings for buffers like BBBuffer<U128> (18 bytes vs 6 bytes overhead on a 32-bit target).

This should be possible by following the tricks used by heapless, and could be made backwards compatible to alias current constructors to use usize as the generic parameter.

This would also help in making this mergable into heapless, CC https://github.com/japaric/heapless/issues/65

CC @korken89, who I think is better at generic shenanigans that I am :)

Yeah, this is no problem to do, ping me if you want some help :)