Uncommented MqttSuback
Uncommented MqttUnsubscribe
Uncommented MqttUnsuback
Uncommented MqttDisconnect
Uncommented MqttPingReq
Uncommented MqttPingResp
Moved all class definitions from message.cpp to message.hpp
Added first encode test
Added test DecerealiseMqttHeader. It fails
Uncommented a bunch of tests in encode.cpp. One of them fails now