Support forever scope

[bilelmoussaoui]

Currently gir fails with when trying to generate Pango2 (1.90 currently) bindings

Error: Error: "GirXml: pango2/sys/../../Pango2-1.0.gir at line 1775:11: Attribute `scope` on element <parameter> has invalid value: Unknown parameter scope type: forever"

[sdroege]

Yeah that's an easy one. GStreamer also has a couple of those but not annotated accordingly and manually bound.

[bilelmoussaoui]

Do you remember which ones that needs to be fixed so I can try my changes?

[sdroege]

They will continue to stay manual because of other issues. gst_tag_register() for example.

[Vanadiae]

I also tried generating pango2 bindings and encountered the same issue. After some grepping and code reading it looks like the code that need to be changed live in library.rs and analysis/rust_type.rs, but apart from that I've no knowledge about how gir works. For now I've replaced the "forever" scopes with "call" even if that's wrong, but I won't use pango2_attr_type_register() for now so that's not so much of an issue.