a166cee7d1f0409fd6bca328ff07f6355adfac46
Add runloop source and observer functionality I had the need to add a source (from `SCDynamicStoreCreateRunLoopSource`). And since all the add/contains/remove operations were fairly trivial I did not see any reason to not complete them for timers, sources and observers at the same time. Also adding the `CFRunLoopMode` type alias to make the signatures reflect the original API a bit more. Lastly, removing underscore from `_info` since it's actually used. <!-- Reviewable:start --> --- This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/core-foundation-rs/130) <!-- Reviewable:end -->
core-foundation-rs
Compatibility
By default it targets macOS 10.7.
To enable features added in macOS 10.8, set Cargo feature mac_os_10_8_features. To have both 10.8 features and 10.7 compatibility, also set mac_os_10_7_support. Setting both requires weak linkage, which is is a nighty-only feature as of Rust 1.19.
Description
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Rust
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