feat(assists): Make raw string unescaped

[Geobert]

Last piece of #1730

[matklad]

I think it's better to only have two assists

1. usual string -> raw string
2. raw string -> usual string

In general, adding many assists is bad, because it makes it harder to find the correct one among the noise.

The assists should be semantic preserving. This is not entirely true at the moment: make raw string of "hello\nworld"; gives r"hello\nworld";, while it should be

r#"hello
world"#;

(not also a hash: I thin it's a good idea to add one hash by default, as, if you don't need hashes, it's easy to just add r yourself)

[Geobert]

So we're discarding the proposal from @bjorn3? (fine by me, just to be sure) I can add the hash by default.

Do we keep "add hash" and "remove hash" assists?

[matklad]

So we're discarding the proposal from bjorn3?

Yeah, I feel like having two flavors of the thing would be more confusing than helpful.

Do we keep "add hash" and "remove hash" assists?

Yep, as they are only available if there's already a string literal.

[matklad]

bors r+

Thanks!

[bors]

Build succeeded

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