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/dnn/perf/perf_convolution.cpp

@@ -1,8 +1,7 @@
 #include "perf_precomp.hpp"
 #include <opencv2/dnn/shape_utils.hpp>
 
-namespace
-{
+namespace opencv_test {
 
 enum {STRIDE_OFF = 1, STRIDE_ON = 2};
 CV_ENUM(StrideSize, STRIDE_OFF, STRIDE_ON);