Expose include-all-objects as global Sphinx option?

[cdeil]

For Gammapy I would like to adopt the default of include-all-objects globally for the docs.

How about adding a automodapi_include_all_object global Sphinx option?

I think it's pretty common to want everything I list in __all__ (e.g. module-level variables like default values or dictionaries) to show up in the docs, no?

For now, is there a way to achieve this default globally for Gammapy?
Or do I have to add :include-all-objects: to every automodapi directive?

[astrofrog]

👍 to add a global option - would you have time to do this?