use strings to connect nodes

This makes the node system somewhat more high-level with the intent of making
working with them far more flexible and stable. By making the architecture more
abstracted, it becomes far less rigid which should allow us to do even more
with it and make it much less crash prone.

app/node/generator/matrix/matrix.h

@@ -44,7 +44,13 @@ public:
 
   virtual void Retranslate() override;
 
-  virtual NodeValueTable Value(NodeValueDatabase& value) const override;
+  virtual NodeValueTable Value(const QString& output, NodeValueDatabase& value) const override;
+
+  static const QString kPositionInput;
+  static const QString kRotationInput;
+  static const QString kScaleInput;
+  static const QString kUniformScaleInput;
+  static const QString kAnchorInput;
 
 protected:
   QMatrix4x4 GenerateMatrix(NodeValueDatabase &value, bool take, bool ignore_anchor, bool ignore_position, bool ignore_scale) const;
@@ -54,44 +60,7 @@ protected:
                                    bool uniform_scale,
                                    const QVector2D &anchor);
 
-  NodeInput* position_input() const
-  {
-    return position_input_;
-  }
-
-  NodeInput* rotation_input() const
-  {
-    return rotation_input_;
-  }
-
-  NodeInput* scale_input() const
-  {
-    return scale_input_;
-  }
-
-  NodeInput* uniform_scale_input() const
-  {
-    return uniform_scale_input_;
-  }
-
-  NodeInput* anchor_input() const
-  {
-    return anchor_input_;
-  }
-
-private:
-  NodeInput* position_input_;
-
-  NodeInput* rotation_input_;
-
-  NodeInput* scale_input_;
-
-  NodeInput* uniform_scale_input_;
-
-  NodeInput* anchor_input_;
-
-private slots:
-  void UniformScaleChanged();
+  virtual void InputValueChangedEvent(const QString& input, int element) override;
 
 };