At least on the surface, the announcement barely caused a ripple — a noticeable shift from the past, when the threat of a Raytheon decampment triggered a special targeted tax cut, designed to convince the company to stay here. But times have changed. Boston and environs have morphed into a hot biotech and innovation hub, turning the big companies of yore into yesterday's news. Raytheon also lowered the anxiety level by saying there are no workforce reduction plans for Massachusetts, although time will tell if that holds true.