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/platforms/android/service/engine/res/layout/main.xml

@@ -0,0 +1,49 @@
+<?xml version="1.0" encoding="utf-8"?>
+<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
+    android:id="@+id/ScrollBox"
+    android:layout_width="fill_parent"
+    android:layout_height="fill_parent" >
+
+    <LinearLayout
+        android:layout_width="fill_parent"
+        android:layout_height="wrap_content"
+        android:gravity="center_vertical|center_horizontal"
+        android:orientation="vertical"
+        android:scrollbarStyle="insideInset" >
+
+        <TextView
+            android:id="@+id/textView4"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="@string/about"
+            android:textAppearance="?android:attr/textAppearanceLarge" />
+
+        <TextView
+            android:id="@+id/textViewIntro"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:autoLink="web"
+            android:text="@string/intro"
+            android:textAppearance="?android:attr/textAppearanceSmall" />
+
+        <TextView
+            android:id="@+id/textView5"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:textAppearance="?android:attr/textAppearanceSmall" />
+
+        <TextView
+            android:id="@+id/textView6"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:textAppearance="?android:attr/textAppearanceSmall" />
+
+        <Button
+            android:id="@+id/CheckEngineUpdate"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_gravity="center_vertical|center_horizontal"
+            android:text="@string/checkUpdate" />
+    </LinearLayout>
+
+</ScrollView>