Update for game release builds

Hi everyone

I made an update to the project in regards to using it in exported games. When playtesting my own game, I found a bug where the save system didn't work as expected on some systems. I found out this had primarily to do with how I accessed the modification time of the file from the Godot internal property list, as well as the compression of the thumbnail. Compression for the thumbnail image is now deactivated by default, allowing the save system to also work on some combination of older hardware and non-windows systems. The bug occurred on the Steam Deck as well as on Windows 7 PCs. Disabling the compression is the most straight forward solution to fixing the bug. Any other solution would require to change how Godot internals work.

You can enable the compression again if you want. There are instructions for that in the source code. Though honestly I don't recommend it, unless the change in save file size really bothers you for your own project.

Anyway that's it for today. Thanks for reading and until next time bye bye.