add dll export to reference counter

ReferenceCounter.h

@@ -1,5 +1,6 @@
 #pragma once
 
+#include "Betriebssystem.h"
 
 namespace Framework
 {
@@ -9,10 +10,10 @@ namespace Framework
         int ref;
 
     public:
-        ReferenceCounter();
-        virtual ~ReferenceCounter();
+        DLLEXPORT ReferenceCounter();
+        DLLEXPORT virtual ~ReferenceCounter();
 
-        void *getThis();
-        void *release();
+        DLLEXPORT void *getThis();
+        DLLEXPORT void *release();
     };
 }