Add SharedStaticCell #23
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Trying to implement the idea from last week's discussions, here is a once-writeable static cell that only provides shared access. A use case might be sharing an appropriate driver with an interrupt handler as
SharedStaticCell<Mutex<T>>instead ofMutex<RefCell<Option<T>>>, or to store some immutable configuration loaded from some external source, like device info. Far fetched? Maybe :)