code: use macros for default node functions

Easier to maintain

app/node/project/projectsettings/projectsettings.h

@@ -31,7 +31,7 @@ class ProjectSettingsNode : public Node
 public:
   ProjectSettingsNode();
 
-  NODE_DEFAULT_DESTRUCTOR(ProjectSettingsNode)
+  NODE_DEFAULT_FUNCTIONS(ProjectSettingsNode)
 
   virtual QString Name() const override
   {
@@ -53,11 +53,6 @@ public:
     return tr("Settings used throughout the project.");
   }
 
-  virtual Node* copy() const override
-  {
-    return new ProjectSettingsNode();
-  }
-
   enum CacheSetting {
     kCacheUseDefaultLocation,
     kCacheStoreAlongsideProject,