Commits on May 23, 2020

1. aead: split Aead(Mut) from Aead(Mut)InPlace (fixes #70) …

   Splits the `Aead` and `AeadMut` trait into the following:
   
   - `Aead` and `AeadMut`:gated on the `alloc` feature
   - `AeadInPlace` and `AeadMutInPlace`: object-safe, always available
   
   This further has the benefit that implementors who don't want to provide
   or abstract over the in-place APIs no longer have to.
   
   To make the `*InPlace` traits object safe, the one generic parameter
   they previously used (`impl Buffer`) was switched to `dyn Buffer`.
   This adds some vtable dispatch overhead for manipulating the buffer, but
   hopefully it is still cheap compared to the overhead of cryptographic
   operations on the underlying data. That said, no benchmarks have been
   performed (yet) on the costs of this change.

   

   tarcieri committed May 23, 2020
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