slowly cleaning up data types.

pystencilssfg/context.py

pystencilssfg/kernel_namespace.py

pystencilssfg/source_components/header_include.py

pystencilssfg/source_concepts/__init__.py

pystencilssfg/source_concepts/containers.py

pystencilssfg/source_concepts/cpp/__init__.py

pystencilssfg/source_concepts/cpp/std_mdspan.py

pystencilssfg/source_concepts/cpp/std_vector.py

pystencilssfg/source_concepts/source_concepts.py

pystencilssfg/source_concepts/source_objects.py

pystencilssfg/tree/basic_nodes.py

pystencilssfg/tree/conditional.py

pystencilssfg/tree/deferred_nodes.py

pystencilssfg/tree/visitors.py

pystencilssfg/types.py

tests/mdspan/Makefile

tests/mdspan/kernels.py

tests/mdspan/main.cpp