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/contrib/src/rgbdodometry.cpp

@@ -44,11 +44,11 @@
 
 #define SHOW_DEBUG_IMAGES 0
 
-#include "opencv2/core/core.hpp"
-#include "opencv2/calib3d/calib3d.hpp"
+#include "opencv2/core.hpp"
+#include "opencv2/calib3d.hpp"
 
 #if SHOW_DEBUG_IMAGES
-#  include "opencv2/highgui/highgui.hpp"
+#  include "opencv2/highgui.hpp"
 #endif
 
 #include <iostream>