AFRICA MIRROR REPORTER LIONEL Messi’s decision to leave the club he joined as a 13-year-old boy has led to the resignation of Barcelona’s chief executive, deep anger among the club’s fans and wild speculation about his next club. Messi, the Argentinian superstar who is the heart and soul of Barcelona, activated the release clause on his contract days after the club’s 8-2 humiliation at the hands of Bayern Munich in the Champions League quarterfinal. Munich went on to win the trophy with a 1-0 victory over PSG. Following confirmation that Messi (33) has formally handed in a request for the…