new `Using` object with lots of convenience methods (copied over from sbt.IO).
A new `constant` method which will construct a ManagedResource[A] where A is not a resource at all, but a 'constant value'. Note: This is *not* a safe `pure` for those trying to implement cats.Pure or scalaz.Pure, as we need to split the category of types into those which are resources and those which are not.
Please try it out and report any bugs.
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