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/imgproc/test/test_drawing.cpp

@@ -42,10 +42,7 @@
 
 #include "test_precomp.hpp"
 
-namespace {
-
-using namespace std;
-using namespace cv;
+namespace opencv_test { namespace {
 
 //#define DRAW_TEST_IMAGE
 
@@ -757,4 +754,4 @@ TEST(Drawing, line)
     ASSERT_THROW(line(mat, Point(1,1),Point(99,99),Scalar(255),0), cv::Exception);
 }
 
-} // namespace
+}} // namespace