Add toggle-able indent guides for the script editor

[UnderMyWheel (Wheely)]

I actually mistook the new rulers for being indent guides. However, the new rulers feature does function properly in accordance with other external editors. However, I’m not sure how many people were actually in need of rulers compared to indent guides.

Release Notes for 432

@UnderMyWheel @TheRings0fSaturn I think you’re thinking of “indent guides”. If you think that should be added to studio, you should make a feature request! Rulers are just vertical lines and are meant to go through code like that. They’re very common in other editors (even VSCode has an "editors.rulers" setting). Usually people create a single ruler at either 80 or 120 (by convention). Then you try to make your code not go further than that ruler horizontally. This makes sure no one on your te…