Migrates to outline-internal-sdk, removing the dependency on outline-ss-server
Uses the StreamDialer and PacketListener, decoupling from Shadowsocks.
Reorganize directories. We have to keep the outline/shadowsocks packagem since that's exported, but I now only have what's exported there. The rest is in the outline package.
StreamDialerandPacketListener, decoupling from Shadowsocks.Unblocks https://github.com/Jigsaw-Code/outline-go-tun2socks/pull/113