William, Prince of Wales, 42, earned the title of “king of subtle shade” during an engagement in South Africa on Thursday, November 7, where he appeared to make a veiled jab at his estranged sister-in-law, Meghan Markle, 43. The future monarch was given a pot of sour fig jam while hosting a dinner in Cape Town alongside Billy Porter, Heidi Klum and Winnie Harlow. The heir to the British throne, 42, was snapped curiously looking at the jam, which led a former palace aide to spill, “Nothing happens by accident when it comes to royal photos. It looks very much like he is trolling her.” The ex-act…