Revert "Now using the SceneManager to get the root game objects."
Revert "Now using the SceneManager to get the root game objects."

This reverts commit 08bee17430b585fe48a7301412f3e0b804df866a.

Calling SceneManager.GetActiveScene().GetRootGameObjects() throws a TargetInvocationException when called before the scene is fully loaded. Need to find a different way of doing this if we want to support finding root-level inactive GameObjects.
codecapers/Unity-Scene-Query,Real-Serious-Games/Unity-Scene-Query