Make the scripts executable

src/PythonicAPI/Animation/AnimateActors.py

src/PythonicAPI/DataStructures/DataStructureComparison.py

src/PythonicAPI/GeometricObjects/PlaneSourceDemo.py

src/PythonicAPI/ImplicitFunctions/IsoContours.py

src/PythonicAPI/Visualization/LODProp3D.py

src/PythonicAPI/Visualization/LabelPlacementMapper.py

src/PythonicAPI/Widgets/Slider2D.py