code: use macros for default node functions

Easier to maintain

app/node/math/math/math.cpp

@@ -42,11 +42,6 @@ MathNode::MathNode()
   SetInputProperty(kParamBIn, QStringLiteral("autotrim"), true);
 }
 
-Node *MathNode::copy() const
-{
-  return new MathNode();
-}
-
 QString MathNode::Name() const
 {
   return tr("Math");

app/node/math/math/math.h

@@ -31,9 +31,7 @@ class MathNode : public MathNodeBase
 public:
   MathNode();
 
-  NODE_DEFAULT_DESTRUCTOR(MathNode)
-
-  virtual Node* copy() const override;
+  NODE_DEFAULT_FUNCTIONS(MathNode)
 
   virtual QString Name() const override;
   virtual QString id() const override;

app/node/math/math/mathbase.h

@@ -30,8 +30,6 @@ class MathNodeBase : public Node
 public:
   MathNodeBase() = default;
 
-  NODE_DEFAULT_DESTRUCTOR(MathNodeBase)
-
   enum Operation {
     kOpAdd,
     kOpSubtract,