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/codec/oiio/oiiodecoder.h

@@ -40,7 +40,7 @@ public:
 
   virtual bool SupportsVideo() override{return true;}
 
-  virtual Footage* Probe(const QString& filename, const QAtomicInt* cancelled) const override;
+  virtual Streams Probe(const QString& filename, const QAtomicInt* cancelled) const override;
 
 protected:
   virtual bool OpenInternal() override;
@@ -56,8 +56,6 @@ private:
 
   void CloseImageHandle();
 
-  int64_t last_sequence_index_;
-
   VideoParams::Format pix_fmt_;
 
   int channel_count_;