Fix "ref" parameter (#61)

src-examples/ProxyInterfaceConsumer/Person.cs

@@ -68,11 +68,13 @@ namespace ProxyInterfaceConsumer
         public void In_Out_Ref1(in int a, out int b, ref int c)
         {
             b = 1;
+            c++;
         }
 
         public int In_Out_Ref2(in Address a, out Address b, ref Address c)
         {
             b = new Address();
+            c.HouseNumber = 11;
             return 404;
         }