[solution] build vins and orb-slam based on opencv4

Scheme for regular substitution via VScode.
When encountering an incorrect version of OpenCV

    1. Find.

(find_package\(OpenCV).*

    1. Replace:

$1 REQUIRED)

    1. CV_GRAY2RGB
    1. Find:

CV_(.*GRAY[^)]*)

Replace:

cv::COLOR_$1

    1. CV_AA
  2. Replace:

CV_AA

    1. Replace:

cv::LINE_AA

    1. CV_CALIB_*
    1. Replace:

CV_(CALIB[^ ,)]*)

    1. Replace:

cv::$1

    1. CV_LOAD_IMAGE_UNCHANGED、CV_LOAD_IMAGE_GRAYSCALE
    1. Find:

CV_LOAD_IMAGE_([^ )]*)

    1. Replace:

cv::IMREAD_$1

    1. Most other issues, just add the header file
      1. chessboard.cc Error
      No such file or directory

#include<opencv/cv.h>：

#include <opencv2/imgproc/imgproc_c.h>
#include <opencv2/highgui/highgui_c.h>

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