add 5V stack handler

mission/system/objects/Stack5VHandler.cpp

@@ -0,0 +1,9 @@
+#include "Stack5VHandler.h"
+
+Stack5VHandler::Stack5VHandler(PowerSwitchIF& switcher) : switcher(switcher) {}
+
+ReturnValue_t Stack5VHandler::commandSwitchOn() { return returnvalue::OK; }
+
+ReturnValue_t Stack5VHandler::commandSwitchOff() { return returnvalue::OK; }
+
+bool Stack5VHandler::isSwitchOn() { return false; }