And so it has happened.In an unparalleled moment for European football, 12 top clubs from across the continent - including the Premier League's big six - have announced the formation of a new midweek competition to compete with UEFA's Champions League.Milan, Arsenal, Atlético Madrid, Chelsea, Barcelona, Inter, Juventus, Liverpool, Manchester City, Manchester United, Real Madrid and Tottenham Hotspur have all joined as so-called founding clubs, with Los Blancos president Florentino Perez, Juve chairman Andrea Agnelli and…