Function getUnixTime

src/system.cpp:784–789

double getUnixTime() {
	// This is not guaranteed to return the time since 1970 in C++11. (It only does in C++20).
	// However, it does on all platforms I care about.
	auto duration = std::chrono::system_clock::now().time_since_epoch();
	return std::chrono::duration<double>(duration).count();
}


double getThreadTime() {