ts: refactor OpenCV tests

- removed tr1 usage (dropped in C++17)
- moved includes of vector/map/iostream/limits into ts.hpp
- require opencv_test + anonymous namespace (added compile check)
- fixed norm() usage (must be from cvtest::norm for checks) and other conflict functions
- added missing license headers

modules/features2d/test/test_akaze.cpp

@@ -4,8 +4,7 @@
 
 #include "test_precomp.hpp"
 
-using namespace std;
-using namespace cv;
+namespace opencv_test { namespace {
 
 TEST(Features2d_AKAZE, detect_and_compute_split)
 {
@@ -45,3 +44,5 @@ TEST(Features2d_AKAZE, uninitialized_and_nans)
     Ptr<Feature2D> akaze = AKAZE::create();
     akaze->detectAndCompute(b1, noArray(), keypoints, desc);
 }
+
+}} // namespace