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/objdetect/perf/opencl/perf_cascades.cpp

@@ -3,13 +3,11 @@
 
 #include "opencv2/ts/ocl_perf.hpp"
 
-using namespace std;
-using namespace cv;
+namespace opencv_test
+{
 using namespace perf;
-using std::tr1::make_tuple;
-using std::tr1::get;
 
-typedef std::tr1::tuple<std::string, std::string, int> Cascade_Image_MinSize_t;
+typedef tuple<std::string, std::string, int> Cascade_Image_MinSize_t;
 typedef perf::TestBaseWithParam<Cascade_Image_MinSize_t> Cascade_Image_MinSize;
 
 #ifdef HAVE_OPENCL
@@ -59,3 +57,5 @@ OCL_PERF_TEST_P(Cascade_Image_MinSize, CascadeClassifier,
 }
 
 #endif //HAVE_OPENCL
+
+} // namespace