use hardcoded namespace

The macro defined namespaces confused the hell out of lupdate and more or less broke translations permanently. Looks like the only way we can do it is to have a hardcoded namespace, which goes against my instinct, but honestly how likely is it that we'll change the namespace anyway (I guess forks might want to do it, but that's their problem ;) )

app/render/framehashcache.h

@@ -29,7 +29,7 @@
 #include "render/playbackcache.h"
 #include "render/videoparams.h"
 
-OLIVE_NAMESPACE_ENTER
+namespace olive {
 
 class FrameHashCache : public PlaybackCache
 {
@@ -76,7 +76,7 @@ public:
   QVector<rational> GetInvalidatedFrames(const TimeRange& intersecting);
 
 public slots:
-  void SetHash(const OLIVE_NAMESPACE::rational& time, const QByteArray& hash, const qint64 &job_time, bool frame_exists);
+  void SetHash(const olive::rational& time, const QByteArray& hash, const qint64 &job_time, bool frame_exists);
 
 protected:
   virtual void LengthChangedEvent(const rational& old, const rational& newlen) override;
@@ -97,6 +97,6 @@ private slots:
 
 };
 
-OLIVE_NAMESPACE_EXIT
+}
 
 #endif // VIDEORENDERFRAMECACHE_H