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/perf_precomp.hpp

@@ -0,0 +1,28 @@
+// 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) 2018-2020 Intel Corporation
+
+
+#ifndef __OPENCV_GAPI_PERF_PRECOMP_HPP__
+#define __OPENCV_GAPI_PERF_PRECOMP_HPP__
+
+#include <cstdint>
+#include <vector>
+
+#include <opencv2/ts.hpp>
+#include <opencv2/gapi.hpp>
+#include <opencv2/gapi/imgproc.hpp>
+#include <opencv2/gapi/video.hpp>
+#include <opencv2/gapi/core.hpp>
+#include <opencv2/gapi/cpu/gcpukernel.hpp>
+#include <opencv2/gapi/gpu/ggpukernel.hpp>
+#include <opencv2/gapi/gpu/imgproc.hpp>
+#include <opencv2/gapi/gpu/core.hpp>
+#include <opencv2/gapi/operators.hpp>
+
+#include <opencv2/gapi/fluid/core.hpp>
+#include <opencv2/gapi/fluid/imgproc.hpp>
+
+#endif // __OPENCV_GAPI_PERF_PRECOMP_HPP__