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/doc/py_tutorials/py_tutorials.markdown

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+OpenCV-Python Tutorials {#tutorial_py_root}
+=======================
+
+-   @subpage tutorial_py_table_of_contents_setup
+
+    Learn how to setup OpenCV-Python on your computer!
+
+-   @subpage tutorial_py_table_of_contents_gui
+
+    Here you will learn how to display and save images and videos, control mouse events and create trackbar.
+
+-   @subpage tutorial_py_table_of_contents_core
+
+    In this section you
+    will learn basic operations on image like pixel editing, geometric transformations, code
+    optimization, some mathematical tools etc.
+
+-   @subpage tutorial_py_table_of_contents_imgproc
+
+    In this section
+    you will learn different image processing functions inside OpenCV.
+
+-   @subpage tutorial_py_table_of_contents_feature2d
+
+    In this section
+    you will learn about feature detectors and descriptors
+
+-   @ref tutorial_table_of_content_video
+
+    In this section you
+    will learn different techniques to work with videos like object tracking etc.
+
+-   @subpage tutorial_py_table_of_contents_calib3d
+
+    In this section we
+    will learn about camera calibration, stereo imaging etc.
+
+-   @subpage tutorial_py_table_of_contents_ml
+
+    In this section you
+    will learn different image processing functions inside OpenCV.
+
+-   @subpage tutorial_py_table_of_contents_photo
+
+    In this section you
+    will learn different computational photography techniques like image denoising etc.
+
+-   @ref tutorial_table_of_content_objdetect
+
+    In this section you
+    will learn object detection techniques like face detection etc.
+
+-   @subpage tutorial_py_table_of_contents_bindings
+
+    In this section, we will see how OpenCV-Python bindings are generated