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/project/project.cpp

@@ -88,7 +88,7 @@ void Project::Load(QXmlStreamReader *reader, MainWindowLayoutInfo* layout, uint
 
   foreach (const XMLNodeData::FootageConnection& con, xml_node_data.footage_connections) {
     if (con.footage) {
-      con.input->set_standard_value(QVariant::fromValue(xml_node_data.footage_ptrs.value(con.footage)));
+      con.input->SetStandardValue(QVariant::fromValue(xml_node_data.footage_ptrs.value(con.footage)), con.element);
     }
   }
 }