🐛 Fix cancel SEGV due to noop_coroutine() usage
#59
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It turns out that the noop_coroutine and is well documented in cppreference, that supsequent calls to noop_coroutine() may not point to the same handle, meaning that they may not compare equal. To fix this I've added a
context::noop_sentinelwhich acts as the GND or basis for all coroutines.Resolves #57