Refactor confusing & fragile event bus logic to use callbacks and not channels; ref pterodactyl/panel#2298

router/router_server.go

@@ -198,7 +198,7 @@ func deleteServer(c *gin.Context) {
 	}
 
 	// Unsubscribe all of the event listeners.
-	s.Events().UnsubscribeAll()
+	s.Events().RemoveAll()
 
 	// Destroy the environment; in Docker this will handle a running container and
 	// forcibly terminate it before removing the container, so we do not need to handle