Remove deleted app from memory#2653
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When an app is removed, completely remove it from memory.
app_config.root. If left here stale, the next config update will restart the deleted app.objects. This is needed because otherwise we get anAssertErrorbecause of the unmatched thread count.Possible side effect: When restarting an app because of a config update, it's completely unloaded from memory and then recreated, resulting in a slight performance overhead.
Fixes #2508.