Prioritize RecordType::Refcounted over other record types

[EPashkin]

as only this record type is referenced without mut

cc @GuillaumeGomez, @sdroege

[EPashkin]

Added regen example

[EPashkin]

Record GtkWidgetPath has both ref/unref and copy/free pairs, so detected as RecordType::Boxed before.
It usage has many const access and this breaks build (but maybe gtk-rs/glib#291 helps fix too)

[sdroege]

Doesn't change anything for me and makes sense. If there is the possibility of refcounting, we should use it to prevent copies. The disadvantages of refcounted types exist already anyway (e.g. we can't make this Send without Sync) as C code might already make use of the refcounting.

It might make sense to expose the copy function independently though to be able to create a real copy.

[EPashkin]

We already expose copy for shared(refcounted) records, try find gtk_widget_path_copy in regen example

[sdroege]

Ok then :)

[GuillaumeGomez]

Seems good to me as well! :)

[EPashkin]

Thanks, for review