implement entire project in nodes

Project items are now represented directly in nodes opening up more versatility and possibilities. This is the first iteration of this and will be buggy. Need to test thoroughly.

app/node/nodecopypaste.cpp

@@ -36,7 +36,7 @@ void NodeCopyPasteService::CopyNodesToClipboard(const QVector<Node *> &nodes, vo
   QXmlStreamWriter writer(&copy_str);
   writer.setAutoFormatting(true);
 
-  writer.writeStartDocument();
+  writer.writeStartDocument(QString::number(Core::kProjectVersion));
   writer.writeStartElement(QStringLiteral("olive"));
 
   foreach (Node* n, nodes) {
@@ -65,12 +65,15 @@ QVector<Node *> NodeCopyPasteService::PasteNodesFromClipboard(NodeGraph *graph,
   }
 
   QXmlStreamReader reader(clipboard);
+  uint data_version = reader.documentVersion().toUInt();
 
   QVector<Node*> pasted_nodes;
   XMLNodeData xml_node_data;
 
   while (XMLReadNextStartElement(&reader)) {
     if (reader.name() == QStringLiteral("olive")) {
+      // Default to current version - this may not be desirable?
+
       while (XMLReadNextStartElement(&reader)) {
         if (reader.name() == QStringLiteral("node")) {
           Node* node = nullptr;
@@ -83,7 +86,7 @@ QVector<Node *> NodeCopyPasteService::PasteNodesFromClipboard(NodeGraph *graph,
           }
 
           if (node) {
-            node->Load(&reader, xml_node_data, nullptr);
+            node->Load(&reader, xml_node_data, data_version, nullptr);
 
             pasted_nodes.append(node);
           }