Merge branch 'v2.0-dev' into rangersbach/cuda_blocksizes

src/pystencils/backend/ast/structural.py

src/pystencils/backend/kernelcreation/freeze.py

src/pystencils/backend/platforms/cuda.py

src/pystencils/backend/transformations/add_pragmas.py

src/pystencils/backend/transformations/ast_vectorizer.py

src/pystencils/backend/transformations/eliminate_branches.py

...pystencils/backend/transformations/eliminate_constants.py

...ils/backend/transformations/hoist_loop_invariant_decls.py

src/pystencils/backend/transformations/rewrite.py

src/pystencils/codegen/gpu_indexing.py

src/pystencils/include/PyStencilsField.h

src/pystencils/include/pystencils_runtime/half.h

src/pystencils/include/pystencils_runtime/hip.h

src/pystencils/jit/gpu_cupy.py

src/pystencils/types/types.py

tests/kernelcreation/test_gpu.py