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_io_base64.cpp

@@ -1,12 +1,10 @@
 #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;
 
-typedef std::tr1::tuple<cv::Size, MatType, String> Size_MatType_Str_t;
+typedef tuple<cv::Size, MatType, String> Size_MatType_Str_t;
 typedef TestBaseWithParam<Size_MatType_Str_t> Size_Mat_StrType;
 
 #define MAT_SIZES      ::perf::sz1080p/*, ::perf::sz4320p*/
@@ -84,3 +82,5 @@ PERF_TEST_P(Size_Mat_StrType, fs_base64,
     remove(file_name.c_str());
     SANITY_CHECK_NOTHING();
 }
+
+} // namespace