config: stop destroying config if it was not created
cache np_window_obj in pp_instance_s
deimpl p2n_contruct()
ppb_var: defend against multiple calls of ppb_var_release()
ppb_instance_private_execute_script: keep reference to 'script'
ppb_var_var_from_utf8: shorten name a bit
ppb_var_var_to_utf8: make warning log variable type