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/perf/internal/gapi_compiler_perf_tests.cpp

@@ -0,0 +1,45 @@
+// 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) 2018 Intel Corporation
+
+
+#include "../perf_precomp.hpp"
+#include "../../test/common/gapi_tests_common.hpp"
+
+namespace opencv_test
+{
+using namespace perf;
+
+class CompilerPerfTest : public TestPerfParams<tuple<cv::Size, MatType>> {};
+PERF_TEST_P_(CompilerPerfTest, TestPerformance)
+{
+  const auto params = GetParam();
+  Size sz = get<0>(params);
+  MatType type = get<1>(params);
+
+  initMatsRandU(type, sz, type, false);
+
+  // G-API code ////////////////////////////////////////////////////////////
+  cv::GMat in;
+  auto splitted = cv::gapi::split3(in);
+  auto add1 = cv::gapi::addC({1}, std::get<0>(splitted));
+  auto add2 = cv::gapi::addC({2}, std::get<1>(splitted));
+  auto add3 = cv::gapi::addC({3}, std::get<2>(splitted));
+  auto out = cv::gapi::merge3(add1, add2, add3);
+
+  TEST_CYCLE()
+  {
+      cv::GComputation c(in, out);
+      c.apply(in_mat1, out_mat_gapi, cv::compile_args(cv::gapi::core::fluid::kernels()));
+  }
+
+  SANITY_CHECK_NOTHING();
+}
+
+INSTANTIATE_TEST_CASE_P(CompilerPerfTest, CompilerPerfTest,
+                        Combine(Values(szSmall128, szVGA, sz720p, sz1080p),
+                                Values(CV_8UC3)));
+
+} // namespace opencv_test