The renovation of Morristown’s landmark Headquarters Plaza will look to energize the sprawling concourse that connects three office towers, a Hyatt Regency hotel and a host of retailers and restaurants under the roof of the 1 million-square-foot complex. Not to be overlooked is the idea that the refreshed property will also engage the community in a way that it hasn’t in decades, taking cues from the town’s other recent redevelopment projects.