Implementation of most of the API for Progress. #679
Merged
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This implementation is based on the Darwin NSProgress implementation. One important detail is that swift-corelibs-foundation we do not have Key-Value Observing (KVO) yet. In the meantime, it is suggested to use polling or some other mechanism to read the values.
Updates along the parent/child relationship in Progress are working.
One additional thing that remains is an implementation of the localizedDescription methods. These are customized based on the contents of the userInfo dictionary.