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/python/test/test_persistence.py

@@ -0,0 +1,44 @@
+#!/usr/bin/env python
+""""Core serialization tests."""
+import tempfile
+import os
+import cv2 as cv
+import numpy as np
+from tests_common import NewOpenCVTests
+
+
+class persistence_test(NewOpenCVTests):
+    def test_yml_rw(self):
+        fd, fname = tempfile.mkstemp(prefix="opencv_python_persistence_", suffix=".yml")
+        os.close(fd)
+
+        # Writing ...
+        expected = np.array([[[0, 1, 2, 3, 4]]])
+        expected_str = ("Hello", "World", "!")
+        fs = cv.FileStorage(fname, cv.FILE_STORAGE_WRITE)
+        fs.write("test", expected)
+        fs.write("strings", expected_str)
+        fs.release()
+
+        # Reading ...
+        fs = cv.FileStorage(fname, cv.FILE_STORAGE_READ)
+        root = fs.getFirstTopLevelNode()
+        self.assertEqual(root.name(), "test")
+
+        test = fs.getNode("test")
+        self.assertEqual(test.empty(), False)
+        self.assertEqual(test.name(), "test")
+        self.assertEqual(test.type(), cv.FILE_NODE_MAP)
+        self.assertEqual(test.isMap(), True)
+        actual = test.mat()
+        self.assertEqual(actual.shape, expected.shape)
+        self.assertEqual(np.array_equal(expected, actual), True)
+
+        strings = fs.getNode("strings")
+        self.assertEqual(strings.isSeq(), True)
+        self.assertEqual(strings.size(), len(expected_str))
+        self.assertEqual(all(strings.at(i).isString() for i in range(strings.size())), True)
+        self.assertSequenceEqual([strings.at(i).string() for i in range(strings.size())], expected_str)
+        fs.release()
+
+        os.remove(fname)