Added is back in as DataManager, which Game Objects can have an instance of. Plus exposed as DataManagerPlugin available to Scenes. Removed callback based system and implemented events and fixed the destroy method.
The Scene Manager no longer tries to maintain an 'active' list and instead just iterates the scenes in order, skipping those that aren't awake. Scene array changing events like moveUp etc are queued if the list is being processed and the ScenePlugin has been vastly updated to take care of this. You can now happily move scenes around the list, block scene input, consume input events, switch scenes around and more.
