[Dev] Add top-level .editorconfig for C++, Python...

[pitrou]

Describe the enhancement requested

See https://editorconfig.org/

Some languages such as Python, C++, bash... are used in various parts of our repository, a top-level .editorconfig would help maintain a consistent style at least for the basics (such as indentation).

Component(s)

C++, Developer Tools, Python

[pitrou]

Thoughts @kou @raulcd @assignUser ?

[kou]

I'm OK with this but I don't want to maintain .editorconfig too much to align with our clang-format configuration.

If we have .editorconfig, we can remove **/.dir-locals.el added by me. :-)

[kou]

We should check our style by pre-commit even if we have .editorconfig.

[pitrou]

The EditorConfig spec is extremely basic for now, it mostly only covers indentation and line endings. But it would help working on multiple projects with different indentation settings.

[assignUser]

It seems pretty unintrusive and useful 👍