Cleanup for Spheres and PSC (#827)

* Fade fixes
  * Clean up RenderableSphere. Add orientation properties.
  * Sane defaults for Digital Universe
  * Clean up New Horizons related code
  * Add basic scene
  * Add ability to initialize rotation as quaternion and mat3
  * Adapt legacy code to new Renderable interface

src/rendering/framebufferrenderer.cpp

@@ -950,7 +950,6 @@ void FramebufferRenderer::render(Scene* scene, Camera* camera, float blackoutFac
 
     RenderData data = {
         *camera,
-        psc(),
         std::move(time),
         doPerformanceMeasurements,
         0,