Former Apple engineering manager Dan Crow believes the company’s best days are behind it, he opines in a column for The Guardian. As Crow writes, “…I think Apple has peaked and the story of the next few years will be one of slow but real decline.” Crow cites “a number of signs” showing that Apple is on a downhill slide, including the recent missteps with iOS 6 Maps and the executive reshuffle that jettisoned Scott Forstall…