Use better way to share these code

[todo]

servoarray/src/bin/util.h

Lines 24 to 29 in 477e2a1

	// TODO: Use better way to share these code
	static std::atomic<bool> quit(false);
	void register_signal(int);
	void quit_handler(int);

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This issue was generated by todo based on a TODO comment in 477e2a1 when #23 was merged. cc @MonoMotion.