use uuid for identifying viewers

To aid generating a cache ID, each viewer node needs a UUID. Previous iterations
tried to hash a name and time, but a UUID is a much more efficient way to do
this.

app/node/output/viewer/viewer.cpp

@@ -33,6 +33,9 @@ ViewerOutput::ViewerOutput()
   length_input_ = new NodeInput("length_in");
   length_input_->set_data_type(NodeInput::kRational);
   AddInput(length_input_);
+
+  // Create UUID for this node
+  uuid_ = QUuid::createUuid();
 }
 
 Node *ViewerOutput::copy() const
@@ -125,6 +128,11 @@ rational ViewerOutput::Length()
   return 0;
 }
 
+const QUuid &ViewerOutput::uuid() const
+{
+  return uuid_;
+}
+
 void ViewerOutput::DependentEdgeChanged(NodeInput *from)
 {
   if (from == texture_input_) {

app/node/output/viewer/viewer.h

@@ -21,6 +21,8 @@
 #ifndef VIEWER_H
 #define VIEWER_H
 
+#include <QUuid>
+
 #include "node/node.h"
 #include "render/videoparams.h"
 #include "render/audioparams.h"
@@ -57,6 +59,8 @@ public:
 
   rational Length();
 
+  const QUuid& uuid() const;
+
 protected:
   virtual void DependentEdgeChanged(NodeInput* from) override;
 
@@ -76,14 +80,14 @@ signals:
   void SizeChanged(int width, int height);
 
 private:
+  QUuid uuid_;
+
   NodeInput* texture_input_;
 
   NodeInput* samples_input_;
 
   NodeInput* length_input_;
 
-  rational timebase_;
-
   VideoParams video_params_;
 
   AudioParams audio_params_;

app/render/exporter.cpp

@@ -0,0 +1,6 @@
+#include "exporter.h"
+
+Exporter::Exporter()
+{
+
+}

app/render/exporter.h

@@ -0,0 +1,11 @@
+#ifndef EXPORTER_H
+#define EXPORTER_H
+
+
+class Exporter
+{
+public:
+  Exporter();
+};
+
+#endif // EXPORTER_H

app/render/exporter/openglexporter.cpp

@@ -0,0 +1,6 @@
+#include "openglexporter.h"
+
+OpenGLExporter::OpenGLExporter()
+{
+
+}

app/render/exporter/openglexporter.h

@@ -0,0 +1,11 @@
+#ifndef OPENGLEXPORTER_H
+#define OPENGLEXPORTER_H
+
+
+class OpenGLExporter
+{
+public:
+  OpenGLExporter();
+};
+
+#endif // OPENGLEXPORTER_H