We forgot to run typecheckrpc.go periodically and it didn't work anymore and there were some minor errors in service/rpc2/client.go. Rewrite typecheckrpc.go using go/packages, so that it works with go1.11 and go.mod, and fix the issues in client.go
* Change module name to github.com/go-delve/delve * Change package name in appveyor.yml