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Fixes #128
This PR adds support for iOS app groups. This enables the tweaks to be accessed via iOS extensions that might utilize internal variables common to the main app (think API domain names and the like). I implemented this using a default, optional parameter on the main initializer which is a non-breaking API change for implementing developers. All other changes occurred on internal classes.
I already pulled my branch into my side project app and confirmed it to work. Since this depends upon several OS security mechanisms to work correctly (FileManager's containerURL() function, and the general OS sandbox security mechanisms), I couldn't figure out a way to appropriately unit test this new functionality. If you have thoughts around that I'd be happy to add them.