Merge #466

466: Expose rust debug and use it r=tschwinge a=CohenArthur

Fixes #464 

@philberty I've checked and rust_debug does output on stderr correctly :)

This PR exposes the rust_debug prototype and replaces debug printfs (`fprintf (stderr, ...)`) with calls to rust_debug. This also removes the extra newlines that were added at the end of the fprintf format strings, since calling rust_debug already adds one. Without this, the tests fail due to blank lines in the output.

I have used a template to overload the rust_debug function and pass variadic arguments to the complete version. While the code looks cleaner than using `va_args`, it's also heavier C++. I'm open to changing it and definitely not attached to this implementation.

Most of the PR was made using sed and then clang-format

Co-authored-by: CohenArthur <arthur.cohen@epita.fr>

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