Update ThreeMF to 0.5.0

[IamTheCarl]

Comically minimum effort. Completes #2223 .

I intend to make some bigger changes later but I figured this PR would be an easier starting point.

For my next PR I'd like to adapt the export_3mf, export_stl, and export_obj functions to accept anything implementing std::io::Write instead of a file path, add documentation comments, and then make them public.

[hannobraun]

Thank you, @IamTheCarl, looks great!

Comically minimum effort.

Perfect! Every improvement is worth merging.

For my next PR I'd like to adapt the export_3mf, export_stl, and export_obj functions to accept anything implementing std::io::Write instead of a file path, add documentation comments, and then make them public.

Sounds great!