Added b,s,g click tracking

gui/include/input_state.hpp

@@ -14,6 +14,9 @@ public:
 	//state of tracked keyboard buttons
 	static bool esc_click; //esc changes from up to down
 	static bool space_pressed;
+	static bool b_click;
+	static bool s_click;
+	static bool g_click;
 
 	//mouse position
 	static float mpos_x;