This reverts commit c809532f.

# Conflicts:
#	pystencils/_version.py
#	pystencils/backends/cbackend.py
#	pystencils/cpu/vectorization.py
#	pystencils/datahandling/pycuda.py
#	pystencils/gpu/gpujit.py
#	pystencils/gpu/kernelcreation.py
#	pystencils/gpu/periodicity.py
#	pystencils/gpucuda/__init__.py
#	pystencils/gpucuda/indexing.py
#	pystencils/include/opencl_stdint.h
#	pystencils/transformations.py
#	pystencils/typing/leaf_typing.py

Fix integration pipeline

See merge request pycodegen/pystencils!348

Distinguish between SymPy and pystencils Assignement better

Closes #61

See merge request pycodegen/pystencils!347

Refactor gpu indexing

See merge request pycodegen/pystencils!341

Extension to field read extraction

See merge request pycodegen/pystencils!346

AVX512VL and AVX10 support

See merge request pycodegen/pystencils!345

Vectorize all scalar symbols in vector expressions

See merge request pycodegen/pystencils!344

Do not reorder accesses in `move_constants_before_loop` (quickly)

See merge request pycodegen/pystencils!343