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/test/ocl/test_channels.cpp

@@ -49,7 +49,7 @@
 
 #ifdef HAVE_OPENCL
 
-namespace cvtest {
+namespace opencv_test {
 namespace ocl {
 
 //////////////////////////////////////// Merge ///////////////////////////////////////////////
@@ -464,6 +464,6 @@ OCL_INSTANTIATE_TEST_CASE_P(Channels, MixChannels, Combine(OCL_ALL_DEPTHS, Bool(
 OCL_INSTANTIATE_TEST_CASE_P(Channels, InsertChannel, Combine(OCL_ALL_DEPTHS, OCL_ALL_CHANNELS, Bool()));
 OCL_INSTANTIATE_TEST_CASE_P(Channels, ExtractChannel, Combine(OCL_ALL_DEPTHS, OCL_ALL_CHANNELS, Bool()));
 
-} } // namespace cvtest::ocl
+} } // namespace opencv_test::ocl
 
 #endif // HAVE_OPENCL