Merge branch 'Refactoring' into 'main'

docs/examples/howto_meshplotlib/plot_special.py

docs/examples/howto_meshplotlib/plot_with_custom_fig_ax.py

...ples/howto_meshplotlib/plot_xy_labels_with_shared_axes.py

docs/examples/howto_propertylib/plot_propertylib.py

ogstools/meshlib/__init__.py

ogstools/meshlib/data_processing.py

ogstools/meshplotlib/__init__.py

ogstools/meshplotlib/core.py

ogstools/propertylib/property.py

ogstools/propertylib/tensor_math.py

ogstools/studies/templates/convergence_study.py

tests/test_meshplotlib.py