Rusty imports

[JustusAdam]

Imports currently use the syntax use sf module::qual (f1, f2);.

Ironically enough this has just confused the hell out of me, which, considering that I wrote the bloody thing, may be an indication that its wrong to do that.

Perhaps instead we should fully commit to the syntax used by rust, which is use sf module::qual::{f1, f2} because that is what I just (incorrectly) assumed it was.

I'd like an opinion by @Feliix42 , whether this would invalidate too many of your test cases?

[sertel]

Even if so, they would probably be very easy to fix. So please go ahead with this.