Add network code and tests

.vscode/settings.json

CMakeLists.txt

include/ftl/protocol.hpp

include/ftl/protocol/listener.hpp

include/ftl/protocol/node.hpp

include/ftl/protocol/self.hpp

include/ftl/utility/base64.hpp

src/base64.cpp

src/node.cpp

src/peer.cpp

src/protocol.cpp

src/protocol/tcp.cpp

src/protocol/websocket.cpp

src/self.cpp

src/socket/socket.cpp

src/universe.cpp

src/universe.hpp

test/CMakeLists.txt

test/net_integration.cpp