[Suggestion] Filter NPC stations from !cleanup commands #133

Requesting to filter out NPC stations from !cleanup commands to prevent accidental deletion of them.
You can't delete them from entity list unless you break up the station in-game manually.
I ... dumbly deleted around half of the stations because of my normal cleanup hitting at the end of a month, and It caused over half the npc stations to be deleted.
Not sure if you could filter them, but figured i'd leave a suggestion for it.