RUSTSEC-2020-0139 on 2020-12-09: dces' World type can cause data races

The World type in dces is marked as Send without bounds on its EntityStore and ComponentStore.

This allows non-thread safe EntityStore and ComponentStores to be sent across threads and cause data races.

CVE-2020-36459

GHSA-hxw9-jxqw-jc8j

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