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/highgui/test/test_gui.cpp

@@ -41,20 +41,18 @@
 //M*/
 
 #include "test_precomp.hpp"
-#include "opencv2/highgui.hpp"
+
+namespace opencv_test { namespace {
 
 #if defined HAVE_GTK || defined HAVE_QT || defined HAVE_WIN32UI || defined HAVE_CARBON || defined HAVE_COCOA
 
-using namespace cv;
-using namespace std;
-
 class CV_HighGuiOnlyGuiTest : public cvtest::BaseTest
 {
 protected:
     void run(int);
 };
 
-void Foo(int /*k*/, void* /*z*/) {}
+static void Foo(int /*k*/, void* /*z*/) {}
 
 void CV_HighGuiOnlyGuiTest::run( int /*start_from */)
 {
@@ -95,3 +93,5 @@ void CV_HighGuiOnlyGuiTest::run( int /*start_from */)
 TEST(Highgui_GUI,    regression) { CV_HighGuiOnlyGuiTest test; test.safe_run(); }
 
 #endif
+
+}} // namespace