Change header names from .hh -> .hpp to be "GLOB"ed by CMakeLists.txt and appear in interface

modules/core/include/opencv2/core/detail/pointer-tuple-replacer.hpp

@@ -8,7 +8,7 @@
 #include <tuple>
 #include <type_traits>
 #include <iterator>
-#include "opencv2/core/detail/util.hh"
+#include "opencv2/core/detail/util.hpp"
 #include "opencv2/core/detail/cpp_features.hpp"
 
 //This opencv feature requires certain C++14 features

modules/core/include/opencv2/core/detail/variadic-continuous-checker.hpp

@@ -9,7 +9,7 @@
 #include "opencv2/core.hpp"
 #include <type_traits>
 #include <utility>
-#include "opencv2/core/detail/util.hh"
+#include "opencv2/core/detail/util.hpp"
 
 namespace cv {
 namespace detail {

modules/core/include/opencv2/core/stl/algorithm.hpp

@@ -10,7 +10,7 @@
 #include "opencv2/core/detail/pointer-tuple-replacer.hpp"
 #include "opencv2/core/detail/variadic-continuous-checker.hpp"
 #include "opencv2/core/detail/cpp_features.hpp"
-#include "opencv2/core/detail/util.hh"
+#include "opencv2/core/detail/util.hpp"
 #include <tuple>
 
 //This opencv feature requires return type auto a C++14 feature

modules/core/test/test_stl_forward.cpp

@@ -2,7 +2,7 @@
 // It is subject to the license terms in the LICENSE file found in the top-level directory
 // of this distribution and at http://opencv.org/license.html.
 #include "test_precomp.hpp"
-#include "opencv2/core/stl/algorithm.hh"
+#include "opencv2/core/stl/algorithm.hpp"
 #include "opencv2/core.hpp"
 #include "opencv2/core/detail/cpp_features.hpp"
 #include <numeric>