Shadowsocks-windows: Implement AES-*-GCM

[henrypijames]

Is there any particular reason that this C# port has only implemented Chacha20-, but not AES--GCM? Especially since AES-128-GCM is the fastest among the AEAD schemes,

[hellofwy]

Just because people who want those ciphers, don't have submitted new Pull requests yet.

[Garfield550]

A C# crypto library support ChaCha20-Poly1305 and AES-GCM https://github.com/ektrah/nsec

[SquirrelCoder]

Hey man, could you please support the "AEAD Ciphers"?
Most of the other ones are not great or as fast as the AEAD ones.

Thanks a lot.

[ccboxes]

hope to add it

[wongsyrone]

Done.

[cnmade]

if you want using AEAD, you can download build release from : https://ci.appveyor.com/project/netroby/shadowsocks-windows/build/job/e4m3b88wyk7dhaaj/artifacts

And you may need set the cipher to chacha20-ietf-poly1305