Add ControllerTest Overlay and support not loading new state if previous loaded

examples/PoolBox/application/src/Overlay/ControllerTest/controller_test.cpp

@@ -0,0 +1,7 @@
+#include <stdio.h>
+
+namespace ControllerTest {
+    void main() {
+        printf("CONT: BlubbBlubbBlubb!!\n");
+    }
+}