Performance testing: added option to get list of all values for CV_ENUM; added perf test for cv::Sobel

Since there is no a standard functions cv::min and cv::max which has cv::Scalar argument, removed the performance tests, 
calling the functions cv::min and cv::max with cv::Scalar argument.
Instead of them two performance tests were created which call the functions cv::min and cv::max with 'double' argument.