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This patch started as an effort to make `time::Timer` private. However, in an effort to get the build compiling again, more and more changes were made. This probably should have been broken up, but here we are. I will attempt to summarize the changes here. * Feature flags are reorganized to make clearer. `net-driver` becomes `io-driver`. `rt-current-thread` becomes `rt-core`. * The `Runtime` can be created without any executor. This replaces `enter`. It also allows creating I/O / time drivers that are standalone. * `tokio::timer` is renamed to `tokio::time`. This brings it in line with `std`. * `tokio::timer::Timer` is renamed to `Driver` and made private. * The `clock` module is removed. Instead, an `Instant` type is provided. This type defaults to calling `std::time::Instant`. A `test-util` feature flag can be used to enable hooking into time. * The `blocking` module is moved to the top level and is cleaned up. * The `task` module is moved to the top level. * The thread-pool's in-place blocking implementation is cleaned up. * `runtime::Spawner` is renamed to `runtime::Handle` and can be used to "enter" a runtime context.