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/rmat/rmat_test_common.hpp

@@ -0,0 +1,69 @@
+// 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) 2020 Intel Corporation
+
+#ifndef OPENCV_GAPI_RMAT_TESTS_COMMON_HPP
+#define OPENCV_GAPI_RMAT_TESTS_COMMON_HPP
+
+#include "../test_precomp.hpp"
+#include <opencv2/gapi/rmat.hpp>
+
+namespace opencv_test {
+class RMatAdapterRef : public RMat::Adapter {
+    cv::Mat& m_mat;
+    bool& m_callbackCalled;
+public:
+    RMatAdapterRef(cv::Mat& m, bool& callbackCalled)
+        : m_mat(m), m_callbackCalled(callbackCalled)
+    {}
+    virtual RMat::View access(RMat::Access access) override {
+        RMat::View::stepsT steps(m_mat.dims);
+        for (int i = 0; i < m_mat.dims; i++) {
+            steps[i] = m_mat.step[i];
+        }
+        if (access == RMat::Access::W) {
+            return RMat::View(cv::descr_of(m_mat), m_mat.data, steps,
+                              [this](){
+                                  EXPECT_FALSE(m_callbackCalled);
+                                  m_callbackCalled = true;
+                              });
+        } else {
+            return RMat::View(cv::descr_of(m_mat), m_mat.data, steps);
+        }
+    }
+    virtual cv::GMatDesc desc() const override { return cv::descr_of(m_mat); }
+};
+
+class RMatAdapterCopy : public RMat::Adapter {
+    cv::Mat& m_deviceMat;
+    cv::Mat  m_hostMat;
+    bool& m_callbackCalled;
+
+public:
+    RMatAdapterCopy(cv::Mat& m, bool& callbackCalled)
+        : m_deviceMat(m), m_hostMat(m.clone()), m_callbackCalled(callbackCalled)
+    {}
+    virtual RMat::View access(RMat::Access access) override {
+        RMat::View::stepsT steps(m_hostMat.dims);
+        for (int i = 0; i < m_hostMat.dims; i++) {
+            steps[i] = m_hostMat.step[i];
+        }
+        if (access == RMat::Access::W) {
+            return RMat::View(cv::descr_of(m_hostMat), m_hostMat.data, steps,
+                              [this](){
+                                  EXPECT_FALSE(m_callbackCalled);
+                                  m_callbackCalled = true;
+                                  m_hostMat.copyTo(m_deviceMat);
+                              });
+        } else {
+            m_deviceMat.copyTo(m_hostMat);
+            return RMat::View(cv::descr_of(m_hostMat), m_hostMat.data, steps);
+        }
+    }
+    virtual cv::GMatDesc desc() const override { return cv::descr_of(m_hostMat); }
+};
+} // namespace opencv_test
+
+#endif // OPENCV_GAPI_RMAT_TESTS_COMMON_HPP