Explicit shutdown support #3
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There is an argument to make logic bugs obvious via panics, but a panic that kills the driver thread will stall _all_ timers, whereas an unexpected code path that ends up in a signal value of some sort (e.g. zero duration) will only screw up one timer. Plus, eventually finding a way to have zero panics will shrink code size on embedded systems.
When an immediate tidy shutdown is called for, Handle::shutdown() will tell the driver to wake all waiting timers and exit the thread.
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Based on #2.