By Jennifer Newton King Charles performed a series of subtle gestures that show he’s very much still in charge of the Firm despite scaling back public duties amid cancer treatment, according to an expert. Today, the King led members of the Royal Family at their annual Easter Sunday church service at St George’s Chapel in Windsor Castle \- and afterwards even did a short walkabout greeting members of the public with Queen Camilla. It has been the King’s most significant public appearance since his cancer diagnosis and as he shook hands with wellwishers, one told him: “Keep going strong, keep go…