Read from a std::io Read + Seek and output to a Write

[sharksforarms]

Reader functions can take in a Read + Seek trait impl, write can write to a Write

#100

Feature gated under "std" feature as these are std traits.

For nostd, maybe need to wait for: rust-lang/rust#48331

References:
https://doc.rust-lang.org/std/io/trait.Read.html
https://doc.rust-lang.org/std/io/trait.Write.html
https://doc.rust-lang.org/std/io/trait.Seek.html

[TheWillard]

I'm curious on how this could be implemented, since this feature would really help in some of my projects.
If I'm not mistaken, bitvec is just a wrapper around a Vec, my guess is that we would need to replace it with something like https://github.com/tuffy/bitstream-io or with a trait that is implemented for bitvec and bitstream-io.
Or maybe I'm missing a simpler solution?

[XVilka]

Having this out of the box would really make use of deku easier.

[wcampbell0x2a]

Closing, this is now in released deku.