PHILADELPHIA — On the nation’s 250th anniversary, in the city where the United States was born, it was fitting that the weather for France’s Round of 16 showdown with Paraguay could be easily summed up by a line from the tune “Sit Down, John” from the Broadway play “1776.” “It’s hot as hell in Philadelphia!” Temperatures were expected to hit highs around 100 degrees Saturday, and it had already reached 99 degrees two hours before kickoff at Lincoln Financial Field. There had been some concern ahead of the match that the extreme heat that was smothering the East Coast would impact the start time of the match, but the weather didn’t stop the large and enthusiastic French contingent that made their way to the City of Brotherly Love. Juan Jose Caceres of Paraguay and Kylian Mbappe of France in