Main module headers are moved 1 level up

e.g. <opencv2/core/core.hpp> become <opencv2/core.hpp>

Also renamed <opencv2/core/opengl_interop.hpp> to <opencv2/core/opengl.hpp>

modules/legacy/src/oneway.cpp

@@ -10,7 +10,7 @@
 #include "precomp.hpp"
 #include "opencv2/opencv_modules.hpp"
 #ifdef HAVE_OPENCV_HIGHGUI
-#  include "opencv2/highgui/highgui.hpp"
+#  include "opencv2/highgui.hpp"
 #endif
 #include <stdio.h>
 

modules/legacy/src/precomp.hpp

@@ -45,11 +45,10 @@
 #include "cvconfig.h"
 #endif
 
-#include "opencv2/legacy/legacy.hpp"
+#include "opencv2/legacy.hpp"
 
 #include "opencv2/core/internal.hpp"
-#include "opencv2/video/tracking.hpp"
-#include "opencv2/video/background_segm.hpp"
+#include "opencv2/video.hpp"
 
 #include "opencv2/legacy/blobtrack.hpp"
 #include "opencv2/legacy/compat.hpp"