connectionmanager: make API uses dht::InfoHash instead of std::string

src/jamidht/channeled_transfers.cpp

src/jamidht/connectionmanager.cpp

src/jamidht/connectionmanager.h

src/jamidht/jamiaccount.cpp

src/jamidht/jamiaccount.h

src/jamidht/multiplexed_socket.cpp

src/jamidht/multiplexed_socket.h

src/jamidht/p2p.cpp

test/unitTest/call/call.cpp

test/unitTest/connectionManager/connectionManager.cpp