Fix rightBeforeLoadingScene method overloading

[alxbilger]

A code smell.

SceneLoaderListerner derives from SceneLoader::Listener. The class SceneLoader::Listener has a method rightBeforeLoadingScene accepting a SceneLoader*. But SceneLoaderListerner does not overload it. Instead, it define another method rightBeforeLoadingScene with a different signature. Even if it is intentional, I did not find any call of this signature. So my guess is a wrong overriding of the base method.

However, now that it's properly implemented, I don't know the effects of this call...

[damienmarchal]

The line your are pointing are rather old and calls that code (un SofaRuntime/init.py):

def unloadModules():
    """ Call this function to unload python modules and to force their reload

        (useful to take into account their eventual modifications since
        their last import).
    """
    global __SofaPythonEnvironment_importedModules__
    toremove = [name for name in sys.modules if not name in __SofaPythonEnvironment_importedModules__ and not name in __SofaPythonEnvironment_modulesExcludedFromReload ]
    for name in toremove:
        del(sys.modules[name]) # unload it

I think this was implemented to force the reloading of python modules when loading a new python scene.
The underlying idea is that we don't want the loaded module to be persistent between different scenes.

The hot-reload mechanism as not been really updated since Sofapython2 and it would be worth some cleaning/refreshing.