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/detect_avfoundation.cmake

@@ -0,0 +1,16 @@
+if(APPLE)
+  set(HAVE_AVFOUNDATION TRUE)
+  if(IOS)
+    set(libs "-framework AVFoundation" "-framework QuartzCore")
+  else()
+    set(libs
+      "-framework Cocoa"
+      "-framework Accelerate"
+      "-framework AVFoundation"
+      "-framework CoreGraphics"
+      "-framework CoreMedia"
+      "-framework CoreVideo"
+      "-framework QuartzCore")
+  endif()
+  ocv_add_external_target(avfoundation "" "${libs}" "HAVE_AVFOUNDATION")
+endif()