bors 5f2d4102c5 auto merge of #5479 : Kimundi/rust/str-dealloc, r=z0w0
This makes the `trim` and `substr` functions return a slice instead of an `~str`, and removes the unnecessary `Trimmable` trait (`StrSlice` already contains the same functionality).

Also moves the `ToStr` implementations for the three str types into the str module in anticipation of further untangling.
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