first version of the full translation pass

src/pystencils/nbackend/arrays.py

src/pystencils/nbackend/kernelcreation/freeze.py

src/pystencils/nbackend/kernelcreation/iteration_space.py

src/pystencils/nbackend/kernelcreation/kernelcreation.py

src/pystencils/nbackend/kernelcreation/platform/__init__.py

src/pystencils/nbackend/kernelcreation/platform/basic_cpu.py

src/pystencils/nbackend/kernelcreation/platform/platform.py

src/pystencils/nbackend/kernelcreation/typification.py