Apothecary: Poco 1.6 - libs, core

This PR supersedes all existing Apothecary Poco PRs.

The Apothecary formulae are now in the master branch.  This PR will only include core code changes and ultimately static libs and new headers.

For now, this branch will serve as the basis for testing the newest Poco formulae and when we're satisfied, we can include the libs and merge this one.