SectorCluster|World|Client: Fix SectorCluster destruction order
As the Planes of a Sector might be mapped to from some other sector,we must defer destruction of Subsectors until all observing clustershave removed their mappings.
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SectorCluster|World|Client: Fix SectorCluster destruction order
As the Planes of a Sector might be mapped to from some other sector,
we must defer destruction of Subsectors until all observing clusters
have removed their mappings.