[mpl] plot_on_top, temperature cmap, invert cbar

docs/examples/howto_meshplotlib/plot_meshplotlib_2d.py

ogstools/meshplotlib/__init__.py

ogstools/meshplotlib/_plot_setup.py

ogstools/meshplotlib/core.py

ogstools/meshplotlib/default_setup.py

ogstools/meshplotlib/mesh_series.py

ogstools/meshplotlib/plot_features.py

ogstools/propertylib/defaults.py

ogstools/propertylib/property.py

ogstools/propertylib/vector2scalar.py

tests/test_meshplotlib.py

tests/test_propertylib.py