multiplex socket: pass full certificate in callbacks

src/jamidht/channel_handler.h

src/jamidht/connectionmanager.cpp

src/jamidht/connectionmanager.h

src/jamidht/conversation_channel_handler.cpp

src/jamidht/conversation_channel_handler.h

src/jamidht/jamiaccount.cpp

src/jamidht/multiplexed_socket.cpp

src/jamidht/multiplexed_socket.h

src/jamidht/sync_channel_handler.cpp

src/jamidht/sync_channel_handler.h

src/jamidht/transfer_channel_handler.cpp

src/jamidht/transfer_channel_handler.h

test/unitTest/connectionManager/connectionManager.cpp

test/unitTest/conversation/compability.cpp

...nitTest/conversationRepository/conversationRepository.cpp