std: Rename various slice traits for consistency
std: Rename various slice traits for consistency

ImmutableVector -> ImmutableSlice
ImmutableEqVector -> ImmutableEqSlice
ImmutableOrdVector -> ImmutableOrdSlice
MutableVector -> MutableSlice
MutableVectorAllocating -> MutableSliceAllocating
MutableCloneableVector -> MutableCloneableSlice
MutableOrdVector -> MutableOrdSlice

These are all in the prelude so most code will not break.

[breaking-change]

tomprogrammer/rust-ascii