fix content control (#538)

* update ContentControl
* feat: more debug logging
* fix engine paths

src/frontend/screens/LevelScreen.cpp

@@ -115,6 +115,7 @@ LevelScreen::~LevelScreen() {
 void LevelScreen::initializeContent() {
     auto& content = controller->getLevel()->content;
     for (auto& entry : content.getPacks()) {
+        logger.info() << "initializing pack '" << entry.first << "'";
         initializePack(entry.second.get());
     }
     scripting::on_frontend_init(