began new infrastructure

Yep, this is another one of my "famous" sweeping rewrites. Expect things to break.

Goals for this are:
- Greatly simplify node connections (particularly with arrays) so the code requires less maintenance/is more stable
- Redesign node structure to address issues where UI would stall for lengthy periods of time
- Less reliance on shared ptrs/greater reliance on QObject system for inheritance/memory management
- General code cleanup and improvements

app/node/nodecopypaste.cpp

@@ -148,7 +148,7 @@ QVector<Node *> NodeCopyPasteService::PasteNodesFromClipboard(Sequence *graph, Q
           foreach (Item* item, footage) {
             foreach (Stream* s, static_cast<Footage*>(item)->streams()) {
               if (s == loaded_stream) {
-                con.input->set_standard_value(Node::PtrToValue(s));
+                con.input->SetStandardValue(Node::PtrToValue(s), con.element);
                 found = true;
                 break;
               }