Alex Crichton 7741516a8b std: Collapse SlicePrelude traits
This commit collapses the various prelude traits for slices into just one trait:

* SlicePrelude/SliceAllocPrelude => SliceExt
* CloneSlicePrelude/CloneSliceAllocPrelude => CloneSliceExt
* OrdSlicePrelude/OrdSliceAllocPrelude => OrdSliceExt
* PartialEqSlicePrelude => PartialEqSliceExt
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