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/dynamic_graph.cpp

@@ -0,0 +1,68 @@
+#include <opencv2/gapi.hpp>
+#include <opencv2/gapi/core.hpp>
+#include <opencv2/gapi/cpu/core.hpp>
+
+int main(int argc, char *argv[])
+{
+    (void) argc;
+    (void) argv;
+
+    bool need_first_conversion  = true;
+    bool need_second_conversion = false;
+
+    cv::Size szOut(4, 4);
+    cv::GComputation cc([&](){
+// ! [GIOProtoArgs usage]
+        auto ins = cv::GIn();
+        cv::GMat in1;
+        if (need_first_conversion)
+            ins += cv::GIn(in1);
+
+        cv::GMat in2;
+        if (need_second_conversion)
+            ins += cv::GIn(in2);
+
+        auto outs = cv::GOut();
+        cv::GMat out1 = cv::gapi::resize(in1, szOut);
+        if (need_first_conversion)
+            outs += cv::GOut(out1);
+
+        cv::GMat out2 = cv::gapi::resize(in2, szOut);
+        if (need_second_conversion)
+            outs += cv::GOut(out2);
+// ! [GIOProtoArgs usage]
+        return cv::GComputation(std::move(ins), std::move(outs));
+    });
+
+// ! [GRunArgs usage]
+    auto in_vector = cv::gin();
+
+    cv::Mat in_mat1( 8,  8, CV_8UC3);
+    cv::Mat in_mat2(16, 16, CV_8UC3);
+    cv::randu(in_mat1, cv::Scalar::all(0), cv::Scalar::all(255));
+    cv::randu(in_mat2, cv::Scalar::all(0), cv::Scalar::all(255));
+
+    if (need_first_conversion)
+        in_vector += cv::gin(in_mat1);
+    if (need_second_conversion)
+        in_vector += cv::gin(in_mat2);
+// ! [GRunArgs usage]
+
+// ! [GRunArgsP usage]
+    auto out_vector = cv::gout();
+    cv::Mat out_mat1, out_mat2;
+    if (need_first_conversion)
+        out_vector += cv::gout(out_mat1);
+    if (need_second_conversion)
+        out_vector += cv::gout(out_mat2);
+// ! [GRunArgsP usage]
+
+    auto stream = cc.compileStreaming(cv::compile_args(cv::gapi::core::cpu::kernels()));
+    stream.setSource(std::move(in_vector));
+
+    stream.start();
+    stream.pull(std::move(out_vector));
+    stream.stop();
+
+    return 0;
+}