Simplify lifetimes #9
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Allows external projects to plug BCS into libraries that expect a `serde` `Serializer` or `Deserializer` implementation.
Since `&'a mut R` is `Read` (or `Write`) when `R` is `Read` (resp. `Write`), there is no need to depend on `<R: ?Sized + Read> &'a mut R` over just plain `<R: Read> R`. The caller can still instantiate `R = &'a mut R_` when a reference is desired (and indeed this is done here for e.g. `MapDeserializer`).
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Atop #8. This generalizes and simplifies the lifetimes used in the
SerializerandDeserializerstructs. Previous behaviour remains by instantiatingR = &mut R_.