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.cpp

@@ -41,9 +41,6 @@ TransformDistort::TransformDistort()
   anchor_input_ = new NodeInput("anchor_in");
   anchor_input_->set_data_type(NodeParam::kVec2);
   AddParameter(anchor_input_);
-
-  matrix_output_ = new NodeOutput("matrix_out");
-  AddParameter(matrix_output_);
 }
 
 Node *TransformDistort::copy() const
@@ -71,11 +68,6 @@ QString TransformDistort::Description() const
   return tr("Apply transformations to position, rotation, and scale.");
 }
 
-NodeOutput *TransformDistort::matrix_output()
-{
-  return matrix_output_;
-}
-
 void TransformDistort::Retranslate()
 {
   position_input_->set_name(tr("Position"));