Keep utf8 if it is available

[ambs]

This is not meant to be merged yet, but a first step in the direction of outputting utf8 directly if it is available.

Not sure if some non-printable characters need to be protected anyway. I lack knowledge on that.

If you like the idea, please let me know how to make it better, and I'll be happy to help.

(as a reference, this is a PR from CPAN PR Challenge)