rem: ECA_LOG_MSG(ECA_LOGGER::system_objects, "(eca-engine) Signaling stop");
add: ecadebug->msg(ECA_DEBUG::system_objects, "(eca-engine) Signaling stop");
context: void ECA_ENGINE::signal_stop(void){  pthread_mutex_lock(&impl_repp->ecasound_stop_mutex_repp);  ECA_LOG_MSG(ECA_LOGGER::system_objects, "(eca-engine) Signaling stop");  pthread_cond_broadcast(&impl_repp->ecasound_stop_cond_repp);  pthread_mutex_unlock(&impl_repp->ecasound_stop_mutex_repp);}