Attack server - improvements

[BramComyn]

Improving on the attack server

After a short feedback-chat, I have decided to improve further on the attack server. The idea is there, but the execution can be done a little better.

Checklist

• [x] decouple response generation from http and http2 modules;
• [x] make response generation dynamic through parameters
• [x] code clean-up for ResponseGenerator
  • [x] one class, one file
• [x] code clean-up for AttackServer
  • [x] de-double on code in methods
• [x] general code and directory clean-up
  • [x] file structure and exports
• [x] rewrite client
• [x] write tests and CI

Further development focus

I will start out by rewriting the code in a more durable way, focusing on improving naming, code style and decoupling.

• [x] making an infinite stream by extending the Readable class

[BramComyn]

This issue will be closed once I merge #18