[SceneChecking] MissingRequiredPlugins: Adapts messages for xml and python users

[EulalieCoevoet]

This PR improves the message about missing required plugins for python users. Before it was printing lines to cut and paste in the scene (which is really nice!), but only for xml users. Now I propose to check the scene's extension and adapt the message.

Here's an example for python:

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[damienmarchal]

Thanks @EulalieCoevoet for this nice contribution.

It is still unclear to me if instead of having the extension passed by changing the SceneChecker API it would not be a better to use Base::getInstanciationSourceFileName().

@alxbilger, what is your opinion ?

[ci-build][with-scene-tests]

[EulalieCoevoet]

Sure, if such method exists I should use that. Thanks for pointing it out.

[damienmarchal]

Yes the method exists... but, contrary to the XML loader, the SofaPython3 scene loader does not use the setInstanciationSourceFileName to set the filename associated with the root node.
This can be done in a simple PR at SofaPython3.

EDIT: I made a quick pr to for SofapythoN3: sofa-framework/SofaPython3#271

[alxbilger]

This is how I would do it:

1. Separate the SceneCheckMissingRequiredPlugin class into 3: 1) an abstract base class, 2) a derived class printing the XML summary, 3) a derived class printing the Python summary.
2. Move the XML class near the XML scene loader
3. Move the Python class in SofaPython3
4. Add (optionally) a new instance of the classes in each scene loader (see void addListener( Listener* l ))

I admit this is quite complex to do. The reason is that all the scene checkers are all grouped in the same module, and SceneCheck is not in Core (but it could be).

In any case, I am uncomfortable with the idea to have a scene checker for Python in the core. Somehow, it should be in SofaPython3.

Another case to support is simpleapi :)

[EulalieCoevoet]

Let's close this PR. I'll do another one with Alex's suggestion when I have time.

[damienmarchal]

Too bad, I was just searching for this feature and discovered it was not integrated.