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/dnn/test/npy_blob.cpp

@@ -0,0 +1,94 @@
+// 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) 2017, Intel Corporation, all rights reserved.
+// Third party copyrights are property of their respective owners.
+
+#include "test_precomp.hpp"
+#include "npy_blob.hpp"
+
+namespace cv
+{
+
+static std::string getType(const std::string& header)
+{
+    std::string field = "'descr':";
+    int idx = header.find(field);
+    CV_Assert(idx != -1);
+
+    int from = header.find('\'', idx + field.size()) + 1;
+    int to = header.find('\'', from);
+    return header.substr(from, to - from);
+}
+
+static std::string getFortranOrder(const std::string& header)
+{
+    std::string field = "'fortran_order':";
+    int idx = header.find(field);
+    CV_Assert(idx != -1);
+
+    int from = header.find_last_of(' ', idx + field.size()) + 1;
+    int to = header.find(',', from);
+    return header.substr(from, to - from);
+}
+
+static std::vector<int> getShape(const std::string& header)
+{
+    std::string field = "'shape':";
+    int idx = header.find(field);
+    CV_Assert(idx != -1);
+
+    int from = header.find('(', idx + field.size()) + 1;
+    int to = header.find(')', from);
+
+    std::string shapeStr = header.substr(from, to - from);
+    if (shapeStr.empty())
+        return std::vector<int>(1, 1);
+
+    // Remove all commas.
+    shapeStr.erase(std::remove(shapeStr.begin(), shapeStr.end(), ','),
+                   shapeStr.end());
+
+    std::istringstream ss(shapeStr);
+    int value;
+
+    std::vector<int> shape;
+    while (ss >> value)
+    {
+        shape.push_back(value);
+    }
+    return shape;
+}
+
+Mat blobFromNPY(const std::string& path)
+{
+    std::ifstream ifs(path.c_str(), std::ios::binary);
+    CV_Assert(ifs.is_open());
+
+    std::string magic(6, '*');
+    ifs.read(&magic[0], magic.size());
+    CV_Assert(magic == "\x93NUMPY");
+
+    ifs.ignore(1);  // Skip major version byte.
+    ifs.ignore(1);  // Skip minor version byte.
+
+    unsigned short headerSize;
+    ifs.read((char*)&headerSize, sizeof(headerSize));
+
+    std::string header(headerSize, '*');
+    ifs.read(&header[0], header.size());
+
+    // Extract data type.
+    CV_Assert(getType(header) == "<f4");
+    CV_Assert(getFortranOrder(header) == "False");
+    std::vector<int> shape = getShape(header);
+
+    Mat blob(shape, CV_32F);
+    ifs.read((char*)blob.data, blob.total() * blob.elemSize());
+    CV_Assert((size_t)ifs.gcount() == blob.total() * blob.elemSize());
+
+    return blob;
+}
+
+}  // namespace cv