fontconfig heads up and request for comment

Hello, I am one of the maintainers of the [fontconfig](https://github.com/yeslogic/fontconfig-rs) crate, which [neomacs appears to use](https://github.com/eval-exec/neomacs/blob/0431548ee235d64aa408e7537dd1bf22c34c0f4f/Cargo.toml#L75). I've recently worked on a revamp of the API to better handle and surface errors. Many of the functions now return `Result`. Before publishing the release I was hoping to get feedback from users of the crate. I'd like to check that the changes seem reasonable, are relatively straightforward to adapt to, and any other thoughts about the changes or documentation. I've published a pre-release version: 0.11.0-rc.1. The docs are available at <https://docs.rs/fontconfig/0.11.0-rc.1/fontconfig/>. Feedback can be a comment here, or https://github.com/yeslogic/fontconfig-rs/issues/58 I understand everyone is busy, so if you don't have time or interest in this, that's totally fine, feel free to close the issue.