Fixed a few compile warnings and fixed signal emmission to use
* src/glade-app.c: Fixed a few compile warnings and fixed signal emmission to use g_signal_emit(). * src/glade-property.[ch]: glade_property_set to use a va_list for convenience, added glade_property_set_value for setting properties with GValues. Also added emission of value-changed signal. * src/glade-command.c, src/glade-editor.c, src/glade-gtk.c, src/glade-widget.c: Changed callers.
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