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_v4l.cmake

@@ -0,0 +1,17 @@
+# --- V4L ---
+if(NOT HAVE_V4L)
+  set(CMAKE_REQUIRED_QUIET TRUE) # for check_include_file
+  check_include_file(linux/videodev2.h HAVE_CAMV4L2)
+  check_include_file(sys/videoio.h HAVE_VIDEOIO)
+  if(HAVE_CAMV4L2 OR HAVE_VIDEOIO)
+    set(HAVE_V4L TRUE)
+    set(defs)
+    if(HAVE_CAMV4L2)
+      list(APPEND defs "HAVE_CAMV4L2")
+    endif()
+    if(HAVE_VIDEOIO)
+      list(APPEND defs "HAVE_VIDEOIO")
+    endif()
+    ocv_add_external_target(v4l "" "" "${defs}")
+  endif()
+endif()