Experiment in Godot Demo Project

[m21-cerutti]

Hello,

It's not quite an issue but it seems defaults rules are not completely folllowing the gdscript style guide, I have tried to use it inside https://github.com/godotengine/godot-demo-projects/pull/1085 but it wasn't working out-of-the-box (but it would be great https://github.com/godotengine/godot-demo-projects/issues/1090 to have it).

I think it could be great that we can use it inside godot demo project, at least until https://github.com/godotengine/godot-proposals/issues/3630