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/input/media/media.h

@@ -36,6 +36,8 @@ public:
   StreamPtr footage();
   void SetFootage(StreamPtr f);
 
+  virtual void Retranslate() override;
+
 protected:
   NodeInput* footage_input_;