der: initial Writer trait
#605
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Begins moving core encoding functionality into a `Writer` trait. The longer-term goal is to make the `Encode` trait accept a generic type as a backend, which can enable things like 1-pass PEM encoding or computing key fingerprints by impl'ing `Writer` for a hash function.
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Begins moving core encoding functionality into a
Writertrait.The longer-term goal is to make the
Encodetrait accept a generic type as a backend, which can enable things like 1-pass PEM encoding or computing key fingerprints by impl'ingWriterfor a hash function.