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/timeline/trackreference.h

@@ -49,7 +49,7 @@ private:
 
 };
 
-uint qHash(const TrackReference& r, uint seed);
+uint qHash(const TrackReference& r, uint seed = 0);
 
 }