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/videoio/cmake/init.cmake

@@ -0,0 +1,33 @@
+if(NOT PROJECT_NAME STREQUAL "OpenCV")
+  include(FindPkgConfig)
+endif()
+
+macro(add_backend backend_id cond_var)
+  if(${cond_var})
+    include("${CMAKE_CURRENT_LIST_DIR}/detect_${backend_id}.cmake")
+  endif()
+endmacro()
+
+add_backend("ffmpeg" WITH_FFMPEG)
+add_backend("gstreamer" WITH_GSTREAMER)
+add_backend("v4l" WITH_V4L)
+
+add_backend("aravis" WITH_ARAVIS)
+add_backend("dc1394" WITH_1394)
+add_backend("gphoto" WITH_GPHOTO2)
+add_backend("msdk" WITH_MFX)
+add_backend("openni2" WITH_OPENNI2)
+add_backend("pvapi" WITH_PVAPI)
+add_backend("realsense" WITH_LIBREALSENSE)
+add_backend("ueye" WITH_UEYE)
+add_backend("ximea" WITH_XIMEA)
+add_backend("xine" WITH_XINE)
+
+add_backend("avfoundation" WITH_AVFOUNDATION)
+add_backend("ios" WITH_CAP_IOS)
+
+add_backend("dshow" WITH_DSHOW)
+add_backend("msmf" WITH_MSMF)
+
+add_backend("android_mediandk" WITH_ANDROID_MEDIANDK)
+add_backend("android_camera" WITH_ANDROID_NATIVE_CAMERA)