Release!

Hi, thanks for being interested in this project!

As Godot 4 Beta is getting more and more stable, I decided to port more and more of my 3.x code to Godot 4. This is one of those features:
An easy to integrate save system with a preview image of the saved view! This template was tested with Godot 4 Beta 12. Don't worry, I'll update the source code if it becomes incompatible with a new version of Godot 4. Feel free to leave feedback and have a good day!