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/samples/gpu/CMakeLists.txt

@@ -0,0 +1,61 @@
+ocv_install_example_src(gpu *.cpp *.hpp CMakeLists.txt)
+
+set(OPENCV_CUDA_SAMPLES_REQUIRED_DEPS
+  opencv_core
+  opencv_flann
+  opencv_imgproc
+  opencv_imgcodecs
+  opencv_videoio
+  opencv_highgui
+  opencv_ml
+  opencv_video
+  opencv_objdetect
+  opencv_features2d
+  opencv_calib3d
+  opencv_superres
+  opencv_cudaarithm
+  opencv_cudafilters
+  opencv_cudawarping
+  opencv_cudaimgproc
+  opencv_cudafeatures2d
+  opencv_cudaoptflow
+  opencv_cudabgsegm
+  opencv_cudastereo
+  opencv_cudaobjdetect)
+ocv_check_dependencies(${OPENCV_CUDA_SAMPLES_REQUIRED_DEPS})
+
+if(NOT BUILD_EXAMPLES OR NOT OCV_DEPENDENCIES_FOUND)
+  return()
+endif()
+
+project(gpu_samples)
+if(HAVE_CUDA OR CUDA_FOUND)
+  add_definitions(-DHAVE_CUDA=1)
+endif()
+if(COMMAND ocv_warnings_disable)
+  ocv_warnings_disable(CMAKE_CXX_FLAGS -Wsuggest-override -Winconsistent-missing-override)
+endif()
+ocv_include_modules_recurse(${OPENCV_CUDA_SAMPLES_REQUIRED_DEPS})
+if(HAVE_opencv_xfeatures2d)
+  ocv_include_modules_recurse(opencv_xfeatures2d)
+endif()
+if(HAVE_opencv_cudacodec)
+  ocv_include_modules_recurse(opencv_cudacodec)
+endif()
+if(HAVE_CUDA)
+  ocv_include_directories(${CUDA_INCLUDE_DIRS})
+endif()
+if((CV_GCC OR CV_CLANG) AND NOT ENABLE_NOISY_WARNINGS)
+  set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wno-unused-function")
+endif()
+file(GLOB all_samples RELATIVE ${CMAKE_CURRENT_SOURCE_DIR} *.cpp)
+foreach(sample_filename ${all_samples})
+  ocv_define_sample(tgt ${sample_filename} gpu)
+  ocv_target_link_libraries(${tgt} PRIVATE ${OPENCV_LINKER_LIBS} ${OPENCV_CUDA_SAMPLES_REQUIRED_DEPS})
+  if(HAVE_opencv_xfeatures2d)
+    ocv_target_link_libraries(${tgt} PRIVATE opencv_xfeatures2d)
+  endif()
+  if(HAVE_opencv_cudacodec)
+    ocv_target_link_libraries(${tgt} PRIVATE opencv_cudacodec)
+  endif()
+endforeach()