Reconstruct YOLO V3 code for image detection, demo files, and OpenCV usage

 #include "network.h"

    
 #include "region_layer.h"
    
 #include "cost_layer.h"
    
 #include "utils.h"
    
 #include "parser.h"
    
 #include "box.h"
    
 #include "demo.h"
    
 #include "option_list.h"
    
  
    
 #ifdef OPENCV
    
 #include "opencv2/highgui/highgui_c.h"
    
 #include "opencv2/core/core_c.h"
    
 //#include "opencv2/core/core.hpp"
    
 #include "opencv2/core/version.hpp"
    
 #include "opencv2/imgproc/imgproc_c.h"
    
  
    
 #ifndef CV_VERSION_EPOCH
    
 #include "opencv2/videoio/videoio_c.h"
    
 #define OPENCV_VERSION CVA