Commit cd6f2e2 reformated the .toml, but the 80 char width column is
judged too small to be practical
Add a .taplo.toml file
Also do not split feature array
... using taplo with default settings
I tried this with 4 spaces indentation, but the patch is almost as
big as this one, so I went with default settings instead as that
is just easier:-)
We can't just do `s/#\[no_mangle]/#[unsafe(no_mangle)]/g`
because the version of cbingen we use doesn't understand the unsafe
attribute yet.
Part of #7998
