Refactor boxed wrapper memory management strategy
Change pygi_boxed_new() to accept "copy_boxed" instead of "free_on_dealloc". This changes memory management so the PyGIBoxed wrapper owns the boxed pointer given to it. Use __del__ instead of dealloc for freeing the boxed memory. This is needed for edge cases where objects like GSource can trigger the finalized callback during de-alloc, resulting in the PyObjects references counts being manipulated and triggering a re-entrant de-alloc. Add hack to keep Gtk.TreeIter.do_iter_next/previous implementations working which rely on pass-by-reference. See also: https://bugzilla.gnome.org/show_bug.cgi?id=734465 https://bugzilla.gnome.org/show_bug.cgi?id=722899 https://bugzilla.gnome.org/show_bug.cgi?id=726999
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62aed097