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/cmake/DownloadADE.cmake

@@ -0,0 +1,45 @@
+set(ade_src_dir "${OpenCV_BINARY_DIR}/3rdparty/ade")
+set(ade_filename "v0.1.1f.zip")
+set(ade_subdir "ade-0.1.1f")
+set(ade_md5 "b624b995ec9c439cbc2e9e6ee940d3a2")
+ocv_download(FILENAME ${ade_filename}
+             HASH ${ade_md5}
+             URL
+               "${OPENCV_ADE_URL}"
+               "$ENV{OPENCV_ADE_URL}"
+               "https://github.com/opencv/ade/archive/"
+             DESTINATION_DIR ${ade_src_dir}
+             ID ADE
+             STATUS res
+             UNPACK RELATIVE_URL)
+
+if (NOT res)
+    return()
+endif()
+
+set(ADE_root "${ade_src_dir}/${ade_subdir}/sources/ade")
+file(GLOB_RECURSE ADE_sources "${ADE_root}/source/*.cpp")
+file(GLOB_RECURSE ADE_include "${ADE_root}/include/ade/*.hpp")
+add_library(ade STATIC ${OPENCV_3RDPARTY_EXCLUDE_FROM_ALL}
+    ${ADE_include}
+    ${ADE_sources}
+)
+target_include_directories(ade PUBLIC $<BUILD_INTERFACE:${ADE_root}/include>)
+set_target_properties(ade PROPERTIES
+  POSITION_INDEPENDENT_CODE True
+  OUTPUT_NAME ade
+  DEBUG_POSTFIX "${OPENCV_DEBUG_POSTFIX}"
+  COMPILE_PDB_NAME ade
+  COMPILE_PDB_NAME_DEBUG "ade${OPENCV_DEBUG_POSTFIX}"
+  ARCHIVE_OUTPUT_DIRECTORY ${3P_LIBRARY_OUTPUT_PATH}
+)
+
+if(ENABLE_SOLUTION_FOLDERS)
+  set_target_properties(ade PROPERTIES FOLDER "3rdparty")
+endif()
+
+if(NOT BUILD_SHARED_LIBS)
+  ocv_install_target(ade EXPORT OpenCVModules ARCHIVE DESTINATION ${OPENCV_3P_LIB_INSTALL_PATH} COMPONENT dev OPTIONAL)
+endif()
+
+ocv_install_3rdparty_licenses(ade "${ade_src_dir}/${ade_subdir}/LICENSE")