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In an effort to reach API stability, the `tokio` crate is shedding its _public_ dependencies on crates that are either a) do not provide a stable (1.0+) release with longevity guarantees or b) match the `tokio` release cadence. Of course, implementing `std` traits fits the requirements. The on exception, for now, is the `Stream` trait found in `futures_core`. It is expected that this trait will not change much and be moved into `std. Since Tokio is not yet going reaching 1.0, I feel that it is acceptable to maintain a dependency on this trait given how foundational it is. Since the `Stream` implementation is optional, types that are logically streams provide `async fn next_*` functions to obtain the next value. Avoiding the `next()` name prevents fn conflicts with `StreamExt::next()`. Additionally, some misc cleanup is also done: - `tokio::io::io` -> `tokio::io::util`. - `delay` -> `delay_until`. - `Timeout::new` -> `timeout(...)`. - `signal::ctrl_c()` returns a future instead of a stream. - `{tcp,unix}::Incoming` is removed (due to lack of `Stream` trait). - `time::Throttle` is removed (due to lack of `Stream` trait). - Fix: `mpsc::UnboundedSender::send(&self)` (no more conflict with `Sink` fns).