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/python/tutorial_code/introduction/display_image/display_image.py

@@ -0,0 +1,19 @@
+## [imports]
+import cv2 as cv
+import sys
+## [imports]
+## [imread]
+img = cv.imread(cv.samples.findFile("starry_night.jpg"))
+## [imread]
+## [empty]
+if img is None:
+    sys.exit("Could not read the image.")
+## [empty]
+## [imshow]
+cv.imshow("Display window", img)
+k = cv.waitKey(0)
+## [imshow]
+## [imsave]
+if k == ord("s"):
+    cv.imwrite("starry_night.png", img)
+## [imsave]

3rdparty/opencv-4.5.4/samples/python/tutorial_code/introduction/documentation/documentation.py

@@ -0,0 +1,5 @@
+print('Not showing this text because it is outside the snippet')
+
+## [hello_world]
+print('Hello world!')
+## [hello_world]