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/samples/hal/README.md

@@ -0,0 +1,33 @@
+Custom HAL samples
+==================
+
+Samples in this folder are intended to demonstrate functionality replacement mechanism in the OpenCV library.
+
+The __c_hal__ is the example of pure C replacement library with all functions returning error. It can be used to verify error handling in the function switching code.
+
+The __slow_hal__ contains naive C++ implementations of the element-wise logical array operations (and, or, xor, not) making them twice slower than the default.
+
+Build custom HAL replacement library
+------------------------------------
+
+1. Create folder for build (for example `<home-dir>/my-hal-build`)
+2. Go to the created folder and run cmake: `cmake <opencv-src>/samples/hal/slow_hal`
+3. Run make
+
+After build you will find static library in the build folder: `libslow_hal.a`
+
+Build OpenCV with HAL replacement
+---------------------------------
+
+1. Create folder for build (for example `<home-dir>/my-opencv-build`)
+2. Go to the created folder and run cmake:
+    ```
+    cmake \
+        -DOpenCV_HAL_DIR="<home-dir>/my-hal-build/" \
+        <opencv-src>
+    ```
+3. Run make (or `make opencv_perf_core` to build the demonstration test executable only)
+4. After build you can run the tests and verify that some functions works slower:
+    ```
+    ./bin/opencv_perf_core --gtest_filter=*bitwise_and*
+    ```