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/core/perf/perf_stat.cpp

@@ -1,10 +1,8 @@
 #include "perf_precomp.hpp"
 
-using namespace std;
-using namespace cv;
+namespace opencv_test
+{
 using namespace perf;
-using std::tr1::make_tuple;
-using std::tr1::get;
 
 PERF_TEST_P(Size_MatType, sum, TYPICAL_MATS)
 {
@@ -102,3 +100,5 @@ PERF_TEST_P(Size_MatType, countNonZero, testing::Combine( testing::Values( TYPIC
 
     SANITY_CHECK(cnt);
 }
+
+} // namespace