removed last of the NodeOutput dependencies

Since all Nodes have an output that provides all output values now, we now
never need to add an output from a Node derivative. These changes remove the
last of them and disable the ability to add more outputs from a derivative.

app/node/generator/solid/solid.h

@@ -43,6 +43,8 @@ public:
 
   virtual QString Code() const override;
 
+  virtual void Retranslate() override;
+
 private:
   NodeInput* color_input_;