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/android/mobilenet-objdetect/res/layout/activity_main.xml

@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="utf-8"?>
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context="org.opencv.samples.opencv_mobilenet.MainActivity">
+
+    <org.opencv.android.JavaCameraView
+        android:id="@+id/CameraView"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:visibility="visible" />
+</FrameLayout>

3rdparty/opencv-4.5.4/samples/android/mobilenet-objdetect/res/values/strings.xml

@@ -0,0 +1,3 @@
+<resources>
+    <string name="app_name">opencv_mobilenet</string>
+</resources>