De-singleton-ized the ActorManager.
Added some code that will need to be uncommented when the world refactor is closer to being complete.
Went ahead and used the non-singleton fetch methods for all managers I plan to de-singletonize.
Changed more fetch methods from singleton fetching to going through the entresol.
Fixed some zealous copy pasta.
De-singletonized the AreaEffectManager.
De-singletonized the CameraManager.
De-singletonized the PhysicsManager.
De-singletonized the SceneManager.
Updated the initialization code in the CameraManager.
De-singletonized the TerrainManager.
Made some document fixes and remove the singleton declaration for swig we had in the managers that have been desingletonized.
SoundScapeManager wasn't a singleton to begin with, but still had to apply some updates for it to become a proper WorldManager.