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/cudaarithm/test/test_element_operations.cpp

@@ -44,7 +44,7 @@
 
 #ifdef HAVE_CUDA
 
-using namespace cvtest;
+namespace opencv_test { namespace {
 
 ////////////////////////////////////////////////////////////////////////////////
 // Add_Array
@@ -2795,4 +2795,5 @@ INSTANTIATE_TEST_CASE_P(CUDA_Arithm, PolarToCart, testing::Combine(
     testing::Values(AngleInDegrees(false), AngleInDegrees(true)),
     WHOLE_SUBMAT));
 
+}} // namespace
 #endif // HAVE_CUDA