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/widget/timelinewidget/tool/pointer.cpp

@@ -572,8 +572,6 @@ void PointerTool::FinishDrag(TimelineViewMouseEvent *event)
 
   QUndoCommand* command = new QUndoCommand();
 
-  new NodeGraphBeginOperationCommand(static_cast<NodeGraph*>(parent()->GetConnectedNode()->parent()), command);
-
   if (!blocks_trimming.isEmpty()) {
     foreach (const GhostBlockPair& p, blocks_trimming) {
       TimelineViewGhostItem* ghost = p.ghost;
@@ -730,8 +728,6 @@ void PointerTool::FinishDrag(TimelineViewMouseEvent *event)
     }
   }
 
-  new NodeGraphEndOperationCommand(static_cast<NodeGraph*>(parent()->GetConnectedNode()->parent()), command);
-
   Core::instance()->undo_stack()->pushIfHasChildren(command);
 }