Move away from g_type_class_add_private() g_type_class_add_private() will be deprecated in GLib 2.58. Replace: - g_type_class_add_private() with G_DEFINE_TYPE_WITH_PRIVATE() - G_TYPE_INSTANCE_GET_PRIVATE() with *_get_instance_private()

Frank Zschockelt <lm@freakysoft.de>
Mikael Berthe <mikael@lilotux.net>