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/task/precache/precachetask.h

@@ -21,7 +21,6 @@
 #ifndef PRECACHETASK_H
 #define PRECACHETASK_H
 
-#include "node/input/media/media.h"
 #include "project/item/footage/footage.h"
 #include "project/item/sequence/sequence.h"
 #include "task/render/render.h"
@@ -32,7 +31,7 @@ class PreCacheTask : public RenderTask
 {
   Q_OBJECT
 public:
-  PreCacheTask(VideoStream* footage, Sequence* sequence);
+  PreCacheTask(Footage* footage, int index, Sequence* sequence);
 
   virtual ~PreCacheTask() override;
 
@@ -44,9 +43,9 @@ protected:
   virtual void AudioDownloaded(const TimeRange& range, SampleBufferPtr samples, qint64 job_time) override;
 
 private:
-  VideoStream* footage_;
+  Footage* footage_;
 
-  MediaInput* video_node_;
+  int index_;
 
 };