[Tool] Easier ORB-SLAM2: OpenCV4 support & Map Save/Load included

Hi,

I've built a 'Easy' version of ORB-SLAM2 to solve common installation nightmares.

Main improvements:

• Full OpenCV 4 compatibility
• Native Map Save/Load features
• Simplified dependencies & build process

If you're struggling with setup or missing these features, check it out here: https://github.com/MinChoi0129/Easy-ORB-SLAM2

Hope this helps your research/project!