refined the GC. Now it calls object destructors

samples/makegarbage.noja

@@ -1,10 +1,18 @@
 
+print('Start\n');
+
 i = 0;
-n = 10000000;
+n = 1000;
 
 while i < n:
 	{
 		1 + 1 * 1;
 		i = i + 1;
-		print('\r', 100.0 * i / n, '% ');
+
+		fun printPercent()
+			print('\r', 100.0 * i / n, '% ');
+	
+		printPercent();
 	}
+
+print('End\n');