[Enhancement] Consider project/ide settings at multiple levels

[xposure]

VS has the concept of things like directory props and and other files that can be dropped in the source folder to override things like formatting styles and other rules to be applied. We use that at work to make sure everyone has the same "rules" in the IDE across our developers.

The use case that brought me to create this issue is "format on save" I use it everywhere, but I have to turn it off when I go to modify corlib. It would be nice to be able to turn this off per project (or in some sort of directory props fashion) in situations like this.