Disable interrupts under Mutex #58
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Disabling interrupts while our code is running may help prevent the random crashes I've been experiencing. This required a bit of a refactor because we now want to call hooks without holding a Mutex, which means hooks must be cloneable/moveable.
Unfortunately this PR seems to grow the binary by 10KB, which is much more than I'd expect. The simpler but mostly adequate approach of just disabling interrupts inside
with_app()probably costs much less space - it'd be nice to know why this approach costs so much though.