Godot Project Setup: Add step to set GDScript Export Mode to Text

[KANAjetzt]

Mod Hooks only work if the source code is readable. With Godot 4.3, binary tokenization has been reintroduced and is the default export setting.

• GDScript: Reintroduce binary tokenization on export godotengine/godot#87634

For game developers integrating the Mod Loader, adding a step in the documentation to switch to text mode will be sufficient.

For self-setup, we will need to use GDRE to decompile scripts that require a hook.

Script extensions are not affected by this.

GodotModding/godot-mod-loader#535

Needs to be added here:
https://wiki.godotmodding.com/guides/integration/godot_project_setup/