refactoring. Everything is pointer.

src/system/pins.hpp

@@ -2,18 +2,22 @@
 #define _PINS_HPP_
 
 #include "syselmts.hpp"
+#include "signals.hpp"
 
 class Pin : public SystemElement
 {
+    Signal *sig;
 public:
     Pin(std::string name);
+    bool connected();
+    void connect(Signal *signal);
 };
 
 class Pins : public SystemElementContainer<Pin>
 {
 public:
     Pins(void);
-    Pins(std::vector<Pin> pins);
+    Pins(std::vector<Pin *> pins);
 };
 
 #endif // _PINS_HPP_