Memory consumption is now very low and performance is much better with huge files.

This is achieved by using low-level TelemacFile functions to avoid the need to
rely on a memory buffer when using Hermes.

Replace the removed function inspect.getargspec with inspect.getfullargspec

This was no longer necessary since telemac_cas.get_dico is able to find dictionaries correctly.
Also remove the redudant api_module.get_dico function.

These belonged to the previous XML-based validation system

It no longer raises an invalid exception, and exit gracefully when "--bypass" is used.

This also fixes contour extraction with global models and ensure that outer and inner contours are oriented properly.

The leak was caused by a circular dependency between Matplotlib.LinearTriInterpolator
and its internal trifinder instance, so that both instances were never released.

Also:
- Fix the main function to remove reference files prefixed with "ref" and to
check for .bnd files instead of .cli ones in case of MED meshes.
- Remove obsolete code given that NumPy 1.19 is the minimum version since V8P5