Scrape game data using the RetroAchievements.com API, and output to a .csv file.

You need to add your own API key to the file (look for "APIKEY").

This is based on sample code downloaded from retroachievements.com in 2022.

Note: this is working in php7.3 which is obsolete. I tried upgrading to php8.3 but the script no longer worked.