Remove PlaYUVerPixel.* files

Merge PlaYUVerPixel class into PlaYUVerFrame.h as frame and
pixels are always related. This simplifies the lib files that
are installed

app/VideoSubWindow.cpp

@@ -30,6 +30,8 @@
 #include "QtConcurrent/qtconcurrentrun.h"
 #include "SubWindowAbstract.h"
 
+#include <cassert>
+
 /**
  * \brief Functions to control data stream from stream information
  */