* Add NAT Type Testing utility
* Add dualstack udp support for wireguard outbound
* tidy go.mod
* Do not include stun command on android by default
* fix lints
* add additional test when a secondary server was provided
* Update protoc binary executable files to v3.13.0
* Write proto files in more standard way
* Make go generate & vprotogen compatible with protoc-gen-gofast
* Regenerate pb.go files according to new proto files
* Clean go.sum by running go mod tidy
* Implement mustEmbedUnimplementedServiceServer for gPRC services