fix/update example script simple-scene-energy-tracking.py
removed utils from examples/simple-scene
removed utils from examples (without sub-folders)
removed utils from examples/baraban/
removed utils from examples/bulldozer/
removed utils from examples/chained-cylinders/
removed utils from examples/clumps/
removed utils from examples/concrete/
removed utils from examples/grids/
removed utils from examples/gts-horse/
removed utils from examples/not-working/
removed utils from examples/packs/
removed utils from examples/ring2d/
removed utils from examples/rod-penetration/
removed utils from examples/simple-shear/
removed utils from examples/test/ (without sub-folders)
removed utils from examples/test/vtk-exporter/
removed utils from examples/test/batch/
removed utils from examples/test/performance/
removed utils from examples/test/multi/