Move non-CV functionality from core.hpp to separate utility.hpp header

samples/cpp/tutorial_code/calib3d/camera_calibration/camera_calibration.cpp

@@ -3,10 +3,11 @@
 #include <time.h>
 #include <stdio.h>
 
-#include <opencv2/core/core.hpp>
-#include <opencv2/imgproc/imgproc.hpp>
-#include <opencv2/calib3d/calib3d.hpp>
-#include <opencv2/highgui/highgui.hpp>
+#include <opencv2/core.hpp>
+#include <opencv2/core/utility.hpp>
+#include <opencv2/imgproc.hpp>
+#include <opencv2/calib3d.hpp>
+#include <opencv2/highgui.hpp>
 
 using namespace cv;
 using namespace std;

samples/cpp/tutorial_code/core/how_to_scan_images/how_to_scan_images.cpp

@@ -1,5 +1,6 @@
-#include <opencv2/core/core.hpp>
-#include <opencv2/highgui/highgui.hpp>
+#include <opencv2/core.hpp>
+#include <opencv2/core/utility.hpp>
+#include <opencv2/highgui.hpp>
 #include <iostream>
 #include <sstream>
 

samples/cpp/tutorial_code/core/mat_mask_operations/mat_mask_operations.cpp

@@ -1,6 +1,7 @@
-#include <opencv2/core/core.hpp>
-#include <opencv2/highgui/highgui.hpp>
-#include <opencv2/imgproc/imgproc.hpp>
+#include <opencv2/core.hpp>
+#include <opencv2/core/utility.hpp>
+#include <opencv2/highgui.hpp>
+#include <opencv2/imgproc.hpp>
 #include <iostream>
 
 using namespace std;

samples/cpp/tutorial_code/gpu/gpu-basics-similarity/gpu-basics-similarity.cpp

@@ -1,10 +1,11 @@
 #include <iostream>                   // Console I/O
 #include <sstream>                    // String to number conversion
 
-#include <opencv2/core/core.hpp>      // Basic OpenCV structures
-#include <opencv2/imgproc/imgproc.hpp>// Image processing methods for the CPU
-#include <opencv2/highgui/highgui.hpp>// Read images
-#include <opencv2/gpu/gpu.hpp>        // GPU structures and methods
+#include <opencv2/core.hpp>      // Basic OpenCV structures
+#include <opencv2/core/utility.hpp>
+#include <opencv2/imgproc.hpp>// Image processing methods for the CPU
+#include <opencv2/highgui.hpp>// Read images
+#include <opencv2/gpu.hpp>        // GPU structures and methods
 
 using namespace std;
 using namespace cv;