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_async.py

@@ -0,0 +1,33 @@
+#!/usr/bin/env python
+from __future__ import print_function
+
+import numpy as np
+import cv2 as cv
+
+from tests_common import NewOpenCVTests
+
+class AsyncTest(NewOpenCVTests):
+
+    def test_async_simple(self):
+        m = np.array([[1,2],[3,4],[5,6]])
+        async_result = cv.utils.testAsyncArray(m)
+        self.assertTrue(async_result.valid())
+        ret, result = async_result.get(timeoutNs=10**6)  # 1ms
+        self.assertTrue(ret)
+        self.assertFalse(async_result.valid())
+        self.assertEqual(cv.norm(m, result, cv.NORM_INF), 0)
+
+
+    def test_async_exception(self):
+        async_result = cv.utils.testAsyncException()
+        self.assertTrue(async_result.valid())
+        try:
+            _ret, _result = async_result.get(timeoutNs=10**6)  # 1ms
+            self.fail("Exception expected")
+        except cv.error as e:
+            self.assertEqual(cv.Error.StsOk, e.code)
+
+
+
+if __name__ == '__main__':
+    NewOpenCVTests.bootstrap()