[B41] Auto-explore should stop when proj enter vision range

[Peppersauce]

Maybe not a bug, but... I was auto-exploring dreadfell 8 when a skeleton master archer two-shotted me from the dark. Now the thing is, I could clearly see the first arrow incoming, but haven't had time to stop the auto-explore. so yeah... I just think auto-explore should stop when a projectile enters the player's vision range, just like it does when it sees enemies.