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/features2d/test/test_fast.cpp

@@ -42,8 +42,7 @@
 
 #include "test_precomp.hpp"
 
-using namespace std;
-using namespace cv;
+namespace opencv_test { namespace {
 
 class CV_FastTest : public cvtest::BaseTest
 {
@@ -135,3 +134,5 @@ void CV_FastTest::run( int )
 }
 
 TEST(Features2d_FAST, regression) { CV_FastTest test; test.safe_run(); }
+
+}} // namespace