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/ffmpeg/ffmpegdecoder.h

@@ -35,7 +35,6 @@ extern "C" {
 #include "codec/decoder.h"
 #include "codec/waveoutput.h"
 #include "ffmpegframepool.h"
-#include "project/item/footage/videostream.h"
 
 namespace olive {
 
@@ -57,7 +56,7 @@ public:
   virtual bool SupportsVideo() override{return true;}
   virtual bool SupportsAudio() 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;
@@ -122,7 +121,7 @@ private:
   void InitScaler(int divider);
   void FreeScaler();
 
-  FramePtr RetrieveStillImage(const rational& timecode, const int& divider);
+  //FramePtr RetrieveStillImage(const rational& timecode, const int& divider);
 
   static VideoParams::Format GetNativePixelFormat(AVPixelFormat pix_fmt);
   static int GetNativeChannelCount(AVPixelFormat pix_fmt);
@@ -135,7 +134,7 @@ private:
 
   void ClearFrameCache();
 
-  FFmpegFramePool::ElementPtr RetrieveFrame(const int64_t &target_ts, int divider);
+  FFmpegFramePool::ElementPtr RetrieveFrame(const rational &time, int divider);
 
   void RemoveFirstFrame();