bool set_custom_setting (const std::string, const std::string);
const std::string get_custom_setting (const std::string);
void restore_settings_mask (int i) { _restore_settings_mask = i;}
bool set_custom_setting (const std::string, const std::string);
const std::string get_custom_setting (const std::string);
void restore_settings_mask (int i) { _restore_settings_mask = i;}