Disallow responding to http from an uncorked state (enforce use of res.cork)

[uNetworkingAB]

Collecting all API-breaking ideas and issues

[uNetworkingAB]

• Disallow responding to http from an uncorked state (enforce use of res.cork)

[uNetworkingAB]

This was kind of fixed already in uWS.js. Instead of an error it just shows a warning. That's a good middle solution for now

[uNetworkingAB]

Question is if this is needed also in uWS.