remove shifts, operations, and make caches node-agnostic

app/render/framehashcache.h

@@ -21,9 +21,6 @@
 #ifndef VIDEORENDERFRAMECACHE_H
 #define VIDEORENDERFRAMECACHE_H
 
-#include <QMutex>
-#include <QUuid>
-
 #include "common/rational.h"
 #include "common/timecodefunctions.h"
 #include "common/timerange.h"
@@ -39,9 +36,6 @@ class FrameHashCache : public PlaybackCache
 public:
   FrameHashCache(QObject* parent = nullptr);
 
-  const QUuid &GetUuid() const { return uuid_; }
-  void SetUuid(const QUuid &u) { uuid_ = u; }
-
   const rational &GetTimebase() const { return timebase_; }
 
   void SetTimebase(const rational& tb);
@@ -86,8 +80,6 @@ private:
 
   rational timebase_;
 
-  QUuid uuid_;
-
   static const QString kCacheFormatExtension;
 
 private slots: