Add support for additional C++ file extensions from VSCode

[Ikos3k]

https://github.com/microsoft/vscode/blob/main/extensions/cpp/package.json#L31

[niten94]

I don't read or write C++ code, so I think you should not change anything based on this comment only and maybe wait until someone else comments.

A part of this change is good, since it seems to add filename extensions for C++20 modules. There currently seems to be a lot: https://stackoverflow.com/questions/75733706/what-is-the-file-extension-naming-convention-for-c20-modules

There are the only changes I suggest, from left to right in the changed line:

• \\.c(c(m)?|pp(m)?|xx(m)?|\\+\\+m?)$ → \\.c(c|pp|xx|\\+\\+)m?$
• \\.i(i)?$ → \\.ii?$: Revert, since it should probably be understood as "basic" syntax of regex that this matches example.i
• ino: Remove since this is likely for Arduino code, which has a different file in Micro: arduino.yaml

Maybe \.h(pp)?\\.in$ should be removed, since I'm not sure we should recognize .in now in cpp.yaml only. Instead, Micro should probably ignore this on all filetypes.

I believe .in can be files in any language, with text like @PREFIX@ which a project's build system replaces. Actual examples I've seen are configuration, scripts, and patches.