Use rustfmt when translating

[LegNeato]

rustfmt used to be part of the refactoring tool but currently isn't part of refactoring or translation. I believe that formatting with rustfmt should be part of the translation tool. Doing so will make reading the generated code nicer, makes it so the transpiler code doesn't ever need to care about formatting, and matches user expectations.

[kkysen]

I agree. Given the refactoring engine is not currently supported, and running rustfmt on the transpiler output is quite easy, I think this is something we should do. That said, it is quite easy to do yourself, too.