Qt 5, fixes and passwords

- Ported the code to Qt 5, removing QJson in the process and fixing some
includes as well.
- Got new passwords (not from the website, though - I was too lazy for
that this time).
- Grooveshark might detect abuse and block you: they won't give you a
stream key and IP address if you try to get some stream. Since I didn't
want to work on this right now, I just outputted some more debug
information to the console.