Implement RPi basic version-special code

include/ExtraButtons.hpp

@@ -0,0 +1,28 @@
+#ifndef __EXTRABUTTONS_HPP
+#define __EXTRABUTTONS_HPP
+
+#include <chrono>
+#include "sfml_gfx_structs.hpp"
+
+class ExtraButton {
+public:
+	void initialize(int pi_value, int id, sf::Keyboard::Key corresponding_key, bool is_power, float first_re_press_time, float later_re_press_time);
+	int get_pi_value();
+	void poll(std::queue<SFEvent> &events_queue);
+private:
+	bool initialized = false;
+	int id;
+	sf::Keyboard::Key corresponding_key;
+	bool is_power;
+	int pi_value;
+	bool started;
+	bool after_first;
+	float first_re_press_time;
+	float later_re_press_time;
+	std::chrono::time_point<std::chrono::high_resolution_clock> last_press_time;
+	bool is_time_valid;
+
+	bool is_pressed();
+	bool is_valid();
+};
+#endif