Eliminate ArrayInterfaceStaticArrays Dependency #206

See #205 for details, which has the MWE that was found.

There are two ways to do this. Either:

@generated function ArrayInterfaceCore.ismutable(::Type{<:ArrayPartition{T,S}}) where {T,S}
    res = all(ArrayInterfaceCore.ismutable, S.parameters)
    return :( $res )
end

that needs to be implemented differently so it respects back edges when StaticArrays' dispatches are added to ismutable, or ismutable needs to go to Base.