Create extra hook functions for start, in-between and end-states

[mostafa]

As stated in this #19 (comment), these hook functions should be created:

1. OnTraffic: passes data between the client and server. Callbacks for incoming and outgoing traffic are called here.
2. OnShutdown: shutdown the server, effectively cleaning everything up.
3. OnTick: fires a function every n seconds.
4. onConfigLoaded: the configuration is loaded.
5. onNewLogger: a new logger is created.
6. onNewPool: a new pool is created.
7. onNewProxy: a new proxy is created.
8. onNewServer: a new server is created.
9. onNewClient: a new client is created.
10. onSignal: a new signal is caught.
11. onRun: the server is run.
12. onBooting: the boot sequence is starting.
13. onBooted: the boot sequence is finished.
14. onOpenning: a new connection is just opened.
15. onOpened: the connection is opened.
16. onClosing: the connection is being closed.
17. onClosed: the connection is closed.
18. onIncomingTraffic: incoming traffic from clients (to server).
19. onOutgoingTraffic: outgoing traffic to clients (from server).