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Add droplevels! function for removing unused pool values #31

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@quinnj quinnj commented Nov 22, 2020

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For an array `A` that implements [`levels`](@ref DataAPI.levels)), certain levels may
become "unused" via array modification, meaning the values still exist in the array
"pool", but are no longer present in the actual array values. `droplevels!` remove
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maybe add a reference to refpool explicitly rather than "pool"?

"pool", but are no longer present in the actual array values. `droplevels!` remove
such values to ensure `levels` only returns values that currently exist in the array.

This generic function is owned by DataAPI.jl itself, which is the sole provider of the
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in CategoricalArrays.jl droplevels! returns A. @nalimilan probably can comment better here about the design assumptions.

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