Use objc2-core-foundation

[madsmtm]

Use objc2-core-foundation, which is a (mostly) auto-generated version of core-foundation-sys.

This avoids error-prone use of CFReleaser::new (called CFRetained::from_raw in objc2-core-foundation) in many cases, since objc2-core-foundation handles that correctly according to the memory management rules. Additionally, we use the CFString conversions in objc2-core-foundation to avoid re-implementing them in this crate.

[GuillaumeGomez]

Ah also CI failed because of:

error: unused import: `std::ptr::NonNull`
  --> src/unix/apple/macos/ffi.rs:27:5
   |
27 | use std::ptr::NonNull;
   |     ^^^^^^^^^^^^^^^^^

I'm surprised by the changes in the FFI definitions but if it works, then all good for me, thanks!

[madsmtm]

I think I've fix the CI error now, tested each feature locally.

[GuillaumeGomez]

Well I guess we'll see soon enough. 😉

Thanks a lot! I'll merge once CI is done.