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.cpp

@@ -24,7 +24,7 @@ MediaInput::MediaInput()
 {
   footage_input_ = new NodeInput("footage_in");
   footage_input_->set_data_type(NodeInput::kFootage);
-  AddParameter(footage_input_);
+  AddInput(footage_input_);
 }
 
 StreamPtr MediaInput::footage()
@@ -36,3 +36,8 @@ void MediaInput::SetFootage(StreamPtr f)
 {
   footage_input_->set_value_at_time(0, QVariant::fromValue(f));
 }
+
+void MediaInput::Retranslate()
+{
+  footage_input_->set_name(tr("Footage"));
+}