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/js_tutorials/js_tutorials.markdown

@@ -0,0 +1,32 @@
+OpenCV.js Tutorials {#tutorial_js_root}
+=======================
+-   @subpage tutorial_js_table_of_contents_setup
+
+    Learn how to use OpenCV.js inside your web pages!
+
+-   @subpage tutorial_js_table_of_contents_gui
+
+    Here you will learn how to read and display images and videos, and create trackbar.
+
+-   @subpage tutorial_js_table_of_contents_core
+
+    In this section you will learn some basic operations on image, some mathematical tools and some data structures etc.
+
+-   @subpage tutorial_js_table_of_contents_imgproc
+
+    In this section
+    you will learn different image processing functions inside OpenCV.
+
+-   @subpage tutorial_js_table_of_contents_video
+
+    In this section you
+    will learn different techniques to work with videos like object tracking etc.
+
+-   @subpage tutorial_js_table_of_contents_objdetect
+
+    In this section you
+    will object detection techniques like face detection etc.
+
+-   @subpage tutorial_js_table_of_contents_dnn
+
+    These tutorials show how to use dnn module in JavaScript