use strings to connect nodes

This makes the node system somewhat more high-level with the intent of making
working with them far more flexible and stable. By making the architecture more
abstracted, it becomes far less rigid which should allow us to do even more
with it and make it much less crash prone.

app/widget/nodeparamview/nodeparamviewarraywidget.cpp

@@ -20,22 +20,26 @@
 
 #include "nodeparamviewarraywidget.h"
 
+#include <QEvent>
 #include <QHBoxLayout>
 
+#include "node/node.h"
+
 namespace olive {
 
-NodeParamViewArrayWidget::NodeParamViewArrayWidget(NodeInput *array, QWidget* parent) :
+NodeParamViewArrayWidget::NodeParamViewArrayWidget(Node *node, const QString &input, QWidget* parent) :
   QWidget(parent),
-  array_(array)
+  node_(node),
+  input_(input)
 {
   QHBoxLayout* layout = new QHBoxLayout(this);
 
   count_lbl_ = new QLabel();
   layout->addWidget(count_lbl_);
 
-  connect(array_, &NodeInput::ArraySizeChanged, this, &NodeParamViewArrayWidget::UpdateCounter);
+  connect(node_, &Node::InputArraySizeChanged, this, &NodeParamViewArrayWidget::UpdateCounter);
 
-  UpdateCounter();
+  UpdateCounter(input_, node_->InputArraySize(input_));
 }
 
 void NodeParamViewArrayWidget::mouseDoubleClickEvent(QMouseEvent *event)
@@ -45,9 +49,11 @@ void NodeParamViewArrayWidget::mouseDoubleClickEvent(QMouseEvent *event)
   emit DoubleClicked();
 }
 
-void NodeParamViewArrayWidget::UpdateCounter()
+void NodeParamViewArrayWidget::UpdateCounter(const QString& input, int new_size)
 {
-  count_lbl_->setText(tr("%1 element(s)").arg(array_->ArraySize()));
+  if (input == input_) {
+    count_lbl_->setText(tr("%1 element(s)").arg(new_size));
+  }
 }
 
 NodeParamViewArrayButton::NodeParamViewArrayButton(NodeParamViewArrayButton::Type type, QWidget *parent) :