removed all dependence on NodeOutputs

If Nodes only have the one output, we don't need to do so much differentiation
between them. Previous iteration used outputs as like a distinct function
within a Node (e.g. length output would return one result, buffer output would
produce a different result - each run different code to produce their results).
Now in this iteration, it's more accurate to say a Node is just one function
(which seems more appropriate for a node system anyway).

app/node/distort/transform/transform.h

@@ -36,8 +36,6 @@ public:
   virtual QString Category() const override;
   virtual QString Description() const override;
 
-  NodeOutput* matrix_output();
-
   virtual void Retranslate() override;
 
   virtual NodeValueTable Value(const NodeValueDatabase& value) const override;
@@ -51,8 +49,6 @@ private:
 
   NodeInput* anchor_input_;
 
-  NodeOutput* matrix_output_;
-
 };
 
 #endif // TRANSFORMDISTORT_H