Merge branch 'refactor_packaging' into 'master'

src/pystencils/backends/riscv_instruction_sets.py

src/pystencils/backends/simd_instruction_sets.py

src/pystencils/backends/x86_instruction_sets.py

src/pystencils/bit_masks.py

src/pystencils/boundaries/__init__.py

src/pystencils/boundaries/boundaryconditions.py

src/pystencils/boundaries/boundaryhandling.py

src/pystencils/boundaries/createindexlist.py

src/pystencils/boundaries/createindexlistcython.pyx

src/pystencils/boundaries/inkernel.py

src/pystencils/cache.py

src/pystencils/config.py

src/pystencils/cpu/__init__.py

src/pystencils/cpu/cpujit.py

src/pystencils/cpu/kernelcreation.py

src/pystencils/cpu/msvc_detection.py

src/pystencils/cpu/vectorization.py

src/pystencils/datahandling/__init__.py

src/pystencils/datahandling/blockiteration.py

src/pystencils/datahandling/datahandling_interface.py