Various scripts for different functions

Nicole Portas 813451b4c6 improved mesh to step script hai 3 semanas
exif_change_date.py d02326aa9e improvements hai 2 meses
mesh_to_step.py 813451b4c6 improved mesh to step script hai 3 semanas
repack_slicer.sh f1dd315015 adding useful scripts hai 2 meses