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See : gkngkc#106
This PR fixes gkngkc#43.
Technical details: The original code loads GTK+ inside the Unity process. It causes the gtk_init function to hang in a deadlock (See the backtrace gkngkc#43 (comment)). I separated the GTK+ related code to a new executable (I'm not sure about Unity's directory structure so I bundled the executable in the library) and run it in a separated process (pass input with argv and get output from pipe()-d stdout) when opening a dialog.
Thanks to Menci