Folder structure cleanup for test scenes.
EC_Skyx: add note "If you want to guarantee the same time between all participants, do not use timeMultiplier, but instead drive the time changes manually from a script."
Remove the HideMe-hack from Entity ctor, but keep the ctor still public so that Scene can create entities. Document that entities should not be directly allocate by using operator new.
Add float3x4 EC_Placeable::WorldTransform() for convenience.