feat: 切换后端至PaddleOCR-NCNN，切换工程为CMake

1.项目后端整体迁移至PaddleOCR-NCNN算法，已通过基本的兼容性测试
2.工程改为使用CMake组织，后续为了更好地兼容第三方库，不再提供QMake工程
3.重整权利声明文件，重整代码工程，确保最小化侵权风险

Log: 切换后端至PaddleOCR-NCNN，切换工程为CMake
Change-Id: I4d5d2c5d37505a4a24b389b1a4c5d12f17bfa38c

3rdparty/opencv-4.5.4/modules/gapi/test/common/gapi_stereo_tests.hpp

@@ -0,0 +1,26 @@
+// This file is part of OpenCV project.
+// It is subject to the license terms in the LICENSE file found in the top-level directory
+// of this distribution and at http://opencv.org/license.html.
+//
+// Copyright (C) 2021 Intel Corporation
+
+
+#ifndef OPENCV_GAPI_STEREO_TESTS_HPP
+#define OPENCV_GAPI_STEREO_TESTS_HPP
+
+
+#include <opencv2/gapi/stereo.hpp> // fore cv::gapi::StereoOutputFormat
+
+#include "gapi_tests_common.hpp"
+#include "gapi_parsers_tests_common.hpp"
+
+namespace opencv_test
+{
+
+GAPI_TEST_FIXTURE(TestGAPIStereo, initMatsRandU, FIXTURE_API(cv::gapi::StereoOutputFormat, int, int, double, double, CompareMats), 6,
+                                                             oF, numDisparities, blockSize, baseline,
+                                                             focus, cmpF)
+
+} // namespace opencv_test
+
+#endif // OPENCV_GAPI_STEREO_TESTS_HPP