Core: in utils.h, add a macros, fix existing

 * lasso/utils.h:
   - add macro lasso_ref(object), if object is not null, call
     g_object_ref on it, and return the value, otherwise do nothing and
     return NULL.
   - make a better reporting of bad object release
   - change format type for __LINE__ and dest arguments in
     lasso_release_gobject warning display.
   - add a lasso_check_non_empty_string macro
   - add new macro to extract a specific node type from a list of
     GObject objects.
   - use xmlStrdup not g_strdup for lasso_assign_xml_string
   - add lasso_list_add_gstrv and lasso_check_good_rc
   - add macro lasso_list_get_first_child
   - add inline function to test empty string
   - change macro lasso_check_non_empty_string to use the new inline
     function and go to cleanup
   - fix lasso_check_non_empty_string macro
 * lasso/utils.c:
   - add lasso_gobject_is_of_type returns 0 if first parameters is a
     gobject whose GType is equal to the second parameter, and 1
     otherwise.

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