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/cpp/tutorial_code/HighGUI/AddingImagesTrackbar.cpp

@@ -0,0 +1,73 @@
+/**
+ * @file AddingImagesTrackbar.cpp
+ * @brief Simple linear blender ( dst = alpha*src1 + beta*src2 )
+ * @author OpenCV team
+ */
+
+#include "opencv2/imgcodecs.hpp"
+#include "opencv2/highgui.hpp"
+#include <iostream>
+
+using namespace cv;
+using std::cout;
+
+/** Global Variables */
+const int alpha_slider_max = 100;
+int alpha_slider;
+double alpha;
+double beta;
+
+/** Matrices to store images */
+Mat src1;
+Mat src2;
+Mat dst;
+
+//![on_trackbar]
+/**
+ * @function on_trackbar
+ * @brief Callback for trackbar
+ */
+static void on_trackbar( int, void* )
+{
+   alpha = (double) alpha_slider/alpha_slider_max ;
+   beta = ( 1.0 - alpha );
+   addWeighted( src1, alpha, src2, beta, 0.0, dst);
+   imshow( "Linear Blend", dst );
+}
+//![on_trackbar]
+
+/**
+ * @function main
+ * @brief Main function
+ */
+int main( void )
+{
+   //![load]
+   /// Read images ( both have to be of the same size and type )
+   src1 = imread( samples::findFile("LinuxLogo.jpg") );
+   src2 = imread( samples::findFile("WindowsLogo.jpg") );
+   //![load]
+
+   if( src1.empty() ) { cout << "Error loading src1 \n"; return -1; }
+   if( src2.empty() ) { cout << "Error loading src2 \n"; return -1; }
+
+   /// Initialize values
+   alpha_slider = 0;
+
+   //![window]
+   namedWindow("Linear Blend", WINDOW_AUTOSIZE); // Create Window
+   //![window]
+
+   //![create_trackbar]
+   char TrackbarName[50];
+   sprintf( TrackbarName, "Alpha x %d", alpha_slider_max );
+   createTrackbar( TrackbarName, "Linear Blend", &alpha_slider, alpha_slider_max, on_trackbar );
+   //![create_trackbar]
+
+   /// Show some stuff
+   on_trackbar( alpha_slider, 0 );
+
+   /// Wait until user press some key
+   waitKey(0);
+   return 0;
+}