Fix memory management problems with struct arguments to signals
Replicate struct marshaling logic for determining if struct arguments to signals should be passed by reference to callbacks. Maintain a list of these structs and apply an in-place copy of the struct pointer if the struct wrapper is held longer than the duration of the Python callback. This allows for both mutation of struct arguments from callbacks as well as memory safety incase a callbacks holds onto the struct. https://bugzilla.gnome.org/show_bug.cgi?id=736175
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09161ff6
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