fix: ensure that npcs are removed correctly #1349
Merged
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Motivation
When creating a npc on a service created from a static task, the infolines (and for entity npcs even the entity itself) are saved to the disk. After restarting the service the entity and info lines are duplicated because the plugin respawns them (as it should) but there are still the old ones from the disk.
Modification
Added a new close method to the PlatformNPCManagement. By default it removes all tracked entities (thus all info lines are removed too). The new method is called on plugin disable.
Result
No duplicates.
Other context
Fixes #1348