VMess protocol support

[reflog]

This PR adds VMess protocol support based on https://github.com/SagerNet/sing-vmess package.

It's fully compatible with v2ray, to test (replaces UUID1,UUID2 with some random uuids):

1. start http proxy: http-proxy-lantern -cfgsvrauthtoken blabla -vmess-addr 0.0.0.0:7474 -vmess-uuids UUID1,UUID2
2. start v2ray client: v2ray run -c client.json with the following config

{
  "log": {
    "loglevel": "debug"
  },
  "outbounds": [
    {
      "protocol": "vmess",
      "settings": {
        "vnext": [
          {
            "address": "127.0.0.1",
            "port": 7474,
            "users": [
              {
                "id": "UUID1",
                "security": null
              },
              {
                "id": "UUID2",
                "security": null
              }
            ]
          }
        ]
      }
    }
  ],
  "inbounds": [
    {
      "listen": "127.0.0.1",
      "port": 11083,
      "protocol": "socks"
    }
  ]
}

3. perform a request curl -x socks5://127.0.0.1:11083 'https://ip.oxylabs.io/location'

P.S. I've also added a CLI option to disable panicwrap, which can be very useful when running under debugger

[garmr-ulfr]

LG! Just a few comments, and VMessAddr should be added here.

For the code in outbound.go and server.go that was copied over, is every function needed? Some aren't referenced anywhere else. Would it still work if we removed them?

[garmr-ulfr]

Same as above.

[reflog]

@garmr-ulfr thanks for the review. all points addressed