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/dnn/test/npy_blob.cpp

@@ -85,7 +85,7 @@ Mat blobFromNPY(const std::string& path)
 
     Mat blob(shape, CV_32F);
     ifs.read((char*)blob.data, blob.total() * blob.elemSize());
-    CV_Assert(ifs.gcount() == blob.total() * blob.elemSize());
+    CV_Assert((size_t)ifs.gcount() == blob.total() * blob.elemSize());
 
     return blob;
 }