Connection: more comments.
Connection: forcing initial settings to contain SETTINGS_MAX_CONCURRENT_STREAMS and SETTINGS_INITIAL_WINDOW_SIZE.
Connection: collection TODOs in a new subsection at the end of the file.
Connection: handling incoming SETTINGS frames.
Connection: implementing stream number limitation (SETTINGS_MAX_CONCURRENT_STREAMS).
Tests: fixing failing tests caused by checking for mandatory settings in Connection.
Connection: a new log message.
Connection: new TODO.