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/samples/draw_example.cpp

@@ -0,0 +1,56 @@
+#include <opencv2/imgproc.hpp> // cv::FONT*, cv::LINE*, cv::FILLED
+#include <opencv2/highgui.hpp> // imwrite
+
+#include <opencv2/gapi.hpp>
+#include <opencv2/gapi/render.hpp>
+
+int main(int argc, char *argv[])
+{
+    if (argc < 2) {
+        std::cerr << "Filename required" << std::endl;
+        return 1;
+    }
+
+    const auto font  = cv::FONT_HERSHEY_DUPLEX;
+    const auto blue  = cv::Scalar{ 255,   0,   0}; // B/G/R
+    const auto green = cv::Scalar{   0, 255,   0};
+    const auto coral = cv::Scalar{0x81,0x81,0xF1};
+    const auto white = cv::Scalar{ 255, 255, 255};
+    cv::Mat test(cv::Size(480, 160), CV_8UC3, white);
+
+    namespace draw = cv::gapi::wip::draw;
+    std::vector<draw::Prim> prims;
+    prims.emplace_back(draw::Circle{   // CIRCLE primitive
+            {400,72},                  // Position (a cv::Point)
+            32,                        // Radius
+            coral,                     // Color
+            cv::FILLED,                // Thickness/fill type
+            cv::LINE_8,                // Line type
+            0                          // Shift
+        });
+    prims.emplace_back(draw::Text{     // TEXT primitive
+            "Hello from G-API!",       // Text
+            {64,96},                   // Position (a cv::Point)
+            font,                      // Font
+            1.0,                       // Scale (size)
+            blue,                      // Color
+            2,                         // Thickness
+            cv::LINE_8,                // Line type
+            false                      // Bottom left origin flag
+        });
+    prims.emplace_back(draw::Rect{     // RECTANGLE primitive
+            {16,48,400,72},            // Geometry (a cv::Rect)
+            green,                     // Color
+            2,                         // Thickness
+            cv::LINE_8,                // Line type
+            0                          // Shift
+        });
+    prims.emplace_back(draw::Mosaic{   // MOSAIC primitive
+            {320,96,128,32},           // Geometry (a cv::Rect)
+            16,                        // Cell size
+            0                          // Decimation
+        });
+    draw::render(test, prims);
+    cv::imwrite(argv[1], test);
+    return 0;
+}