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/test_intrin.fp16.cpp

@@ -1,7 +1,10 @@
+// This file is part of OpenCV project.
+// It is subject to the license terms in the LICENSE file found in the top-level directory
+// of this distribution and at http://opencv.org/license.html.
 #include "test_precomp.hpp"
 #include "test_intrin_utils.hpp"
 
-namespace cvtest { namespace hal {
+namespace opencv_test { namespace hal {
 CV_CPU_OPTIMIZATION_NAMESPACE_BEGIN
 
 void test_hal_intrin_float16x4()