Remove deepcopy (closes #3893)
Remove deepcopy (closes #3893)

It's about 23% faster now (testet deepcopy vs. json with random data)

OpenSlides/OpenSlides,jwinzer/OpenSlides,FinnStutzenstein/OpenSlides,tsiegleauq/OpenSlides,jwinzer/OpenSlides,normanjaeckel/OpenSlides,ostcar/OpenSlides,jwinzer/OpenSlides,FinnStutzenstein/OpenSlides,ostcar/OpenSlides,jwinzer/OpenSlides,CatoTH/OpenSlides,ostcar/OpenSlides,normanjaeckel/OpenSlides,tsiegleauq/OpenSlides,CatoTH/OpenSlides,tsiegleauq/OpenSlides,normanjaeckel/OpenSlides,normanjaeckel/OpenSlides,CatoTH/OpenSlides,FinnStutzenstein/OpenSlides,jwinzer/OpenSlides,CatoTH/OpenSlides,OpenSlides/OpenSlides,FinnStutzenstein/OpenSlides