[All] Plugins: Deprecate entrypoint getModuleComponentList()

[fredroy]

99% of the modules/plugins implements getModuleComponentList() with

const char* getModuleComponentList()
{
    /// string containing the names of the classes provided by the plugin
    static std::string classes = core::ObjectFactory::getInstance()->listClassesFromTarget(MODULE_NAME);
    return classes.c_str();
}

And the rest either omitted to implement it, or just forgot to update the list. (e.g MultiThreading)

IMO getModuleComponentList() does not have really a meaning anymore and one should just use ObjectFactory::listClassesFromTarget() directly.
AFAIK, the only piece of code in the SOFA codebase using this entrypoint is Gui.Qt widget, displaying the component list for each loaded plugin.

This PR:

• removes all the entrypoints from Sofa.Component.* (+MultiThreading)
• deprecates getModuleComponentList() calls
• Sofa.Gui.Qt: calls directly listClassesFromTarget(), but still tests if getModuleComponentList() needs to be called
• warns at runtime if one plugin do implement getModuleComponentList()

---

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Reviewers will merge this pull-request only if

• it builds with SUCCESS for all platforms on the CI.
• it does not generate new warnings.
• it does not generate new unit test failures.
• it does not generate new scene test failures.
• it does not break API compatibility.
• it is more than 1 week old (or has fast-merge label).

[alxbilger]

There are unit tests to fix (or remove)

[fredroy]

[ci-build][with-all-tests]

[bakpaul]

LGTM