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cab6cc8086
Some fairly major changes to ensure that the Pin.when_changed property doesn't keep references to the objects owning the callbacks that are assigned. This is vaguely tricky given that ordinary weakref's can't be used with bound methods (which are ephemeral), so I've back-ported weakref.WeakMethod from Py3.4. This solves a whole pile of things like Button instances not disappearing when they're deleted, and makes composite devices containing Buttons much easier to construct as we don't need to worry about partially constructed things not getting deleted.