Add PingIrcPacket
Reorganize packages a bit, rework send(...) methods for incoming new API
Add and Implement Callback system
Callback attributes: private -> protected
Correctly disconnect Server
CallbackHandler.destroy() -> CallbackHandler.kill()
Remove unneeded Client.isServer() method
Add PingPongTask
A good example use of the Callback system
Start to implement some way to kill the Client, not complete
Forgot to remove this one
Move SSLType to the api package, as it's supposed to be used directly by User