Missing Destructors: Issue #307 (#308)

* Adding empty destructor for Scene.

* RenderEngine Destructor empty/no longer default

* Create empty ~ScreenLog

src/rendering/renderengine.cpp

@@ -181,6 +181,11 @@ RenderEngine::RenderEngine()
     addProperty(_disableMasterRendering);
 }
 
+/**
+ * Destructor
+ */
+RenderEngine::~RenderEngine() {}
+
 void RenderEngine::setRendererFromString(const std::string& renderingMethod) {
     _rendererImplementation = rendererFromString(renderingMethod);
 

src/scene/scene.cpp

@@ -92,6 +92,9 @@ Scene::Scene()
     )
 {}
 
+Scene::~Scene(){
+}
+    
 void Scene::setRoot(std::unique_ptr<SceneGraphNode> root) {
     if (_root) {
         removeNode(_root.get());

src/util/screenlog.cpp

@@ -34,7 +34,9 @@ ScreenLog::ScreenLog(std::chrono::seconds timeToLive, LogLevel logLevel)
     : _timeToLive(std::move(timeToLive))
     , _logLevel(logLevel)
 {}
-    
+
+ScreenLog::~ScreenLog() {}
+
 void ScreenLog::removeExpiredEntries() {
     auto t = std::chrono::steady_clock::now();
     auto ttl = _timeToLive;