begin network implementation
added TODO
prepare Header for multiple Network Receivers
server node
Server Switch
working Server Switch
ServerReceiver, simplification: in -> switch -> Receiver -> out
client
split ChatCommon into NetworkCOmmon and Common + fix missing connect
Serializable
Removed NetworkCommon
fix mistake in receivedData + limit chat msg length
Merge branch 'Network'

Conflicts:
	src/MainWindow.cpp
	src/User.cpp
	src/User.h
	src/chat/ChatClient.cpp
	src/chat/ChatClient.h
	src/chat/ChatCommon.cpp
	src/chat/ChatServer.cpp
	src/chat/commands/Commands.h
	src/jdrnix.pro