code: use macros for default node functions

Easier to maintain

app/node/generator/matrix/matrix.cpp

@@ -51,11 +51,6 @@ MatrixGenerator::MatrixGenerator()
   AddInput(kAnchorInput, NodeValue::kVec2, QVector2D(0.0, 0.0));
 }
 
-Node *MatrixGenerator::copy() const
-{
-  return new MatrixGenerator();
-}
-
 QString MatrixGenerator::Name() const
 {
   return tr("Orthographic Matrix");

app/node/generator/matrix/matrix.h

@@ -34,9 +34,7 @@ class MatrixGenerator : public Node
 public:
   MatrixGenerator();
 
-  NODE_DEFAULT_DESTRUCTOR(MatrixGenerator)
-
-  virtual Node* copy() const override;
+  NODE_DEFAULT_FUNCTIONS(MatrixGenerator)
 
   virtual QString Name() const override;
   virtual QString ShortName() const override;