Function emscripten_before_unload

src/main.cpp:415–419

#ifdef __EMSCRIPTEN__
const char* emscripten_before_unload(int eventType, const void *reserved, void *userData) {
    MainStruct& mS = *((MainStruct*)userData);
    mS.m->save_config();
    return "";
}
#endif

void init_logs(MainStruct& mS) {