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/objdetect/misc/java/test/QRCodeDetectorTest.java

@@ -0,0 +1,48 @@
+package org.opencv.test.objdetect;
+
+import java.util.List;
+import org.opencv.core.Mat;
+import org.opencv.objdetect.QRCodeDetector;
+import org.opencv.imgcodecs.Imgcodecs;
+import org.opencv.test.OpenCVTestCase;
+import java.util.Arrays;
+import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.List;
+
+public class QRCodeDetectorTest extends OpenCVTestCase {
+
+    private final static String ENV_OPENCV_TEST_DATA_PATH = "OPENCV_TEST_DATA_PATH";
+    private String testDataPath;
+
+    @Override
+    protected void setUp() throws Exception {
+        super.setUp();
+
+        testDataPath = System.getenv(ENV_OPENCV_TEST_DATA_PATH);
+        if (testDataPath == null)
+            throw new Exception(ENV_OPENCV_TEST_DATA_PATH + " has to be defined!");
+    }
+
+    public void testDetectAndDecode() {
+        Mat img = Imgcodecs.imread(testDataPath + "/cv/qrcode/link_ocv.jpg");
+        assertFalse(img.empty());
+        QRCodeDetector detector = new QRCodeDetector();
+        assertNotNull(detector);
+        String output = detector.detectAndDecode(img);
+        assertEquals(output, "https://opencv.org/");
+    }
+
+    public void testDetectAndDecodeMulti() {
+        Mat img = Imgcodecs.imread(testDataPath + "/cv/qrcode/multiple/6_qrcodes.png");
+        assertFalse(img.empty());
+        QRCodeDetector detector = new QRCodeDetector();
+        assertNotNull(detector);
+        List < String > output = new ArrayList< String >();
+        boolean result = detector.detectAndDecodeMulti(img, output);
+        assertTrue(result);
+        assertEquals(output.size(), 6);
+        List < String > expectedResults = Arrays.asList("SKIP", "EXTRA", "TWO STEPS FORWARD", "STEP BACK", "QUESTION", "STEP FORWARD");
+        assertEquals(new HashSet<String>(output), new HashSet<String>(expectedResults));
+    }
+}