[Issue 13804] BigInt have no binary interface to be used in crypto

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=13804

--- Comment #4 from Jonathan Wilbur <jonathan at wilbur.space> ---
I am currently implementing a bytes() accessor for std.bigint. I will try to
submit the pull request soon. Once done with that, I will create a bytes
mutator for std.bigint. I just need to test on a big-endian system now, then I
should be about ready to push it. I will close this issue when done, or if the
idea is completely rejected.

Per the comments below, I will create a separate issue for implementing powMod.
No promises, but I will *probably* implement that one, too.

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