iter: Enable iteration over slots/tokens/modules #28
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While PKCS#11 URI can identify slots/tokens/modules, P11KitIter is only
capable of iterating over objects.
This patch adds new behaviors to P11KitIter to support iterations over
slots/tokens/modules, using the C coroutine trick as described in:
http://www.chiark.greenend.org.uk/~sgtatham/coroutines.html