feat(headless): Add GhostObjectManagerDummy for headless mode#2150

bobtista wants to merge 2 commits intoTheSuperHackers:mainTheSuperHackers/GeneralsGameCode:mainfrom

bobtista:bobtista/headless-dummy-classesbobtista/GeneralsGameCode:bobtista/headless-dummy-classesCopy head branch name to clipboard