Compression support- zstd, &c

[rektide]

Greetings. Compression would be a great feature for WireGuard & it's roadmap. Perhaps the latest high compression & high throughput, very tuneable Zstd from Cyan4793? I think it'd make a fine complement to the other very nice modern technologies WireGuard has adopted.
http://facebook.github.io/zstd/

IPSec has a decent if not very modern history of compression with deflate, lzs, and lzjh support via IP Compression packets. That shows that there's some precedent for this feature. More recently OpenVPN has added LZ4 support.

Regards. Looking forward to this projects great future,
-rektide