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/perf/opencl/perf_feature2d.cpp

@@ -4,7 +4,7 @@
 
 #ifdef HAVE_OPENCL
 
-namespace cvtest {
+namespace opencv_test {
 namespace ocl {
 
 OCL_PERF_TEST_P(feature2d, detect, testing::Combine(Feature2DType::all(), TEST_IMAGES))