feat: fire extinguishers put out creatures too

[chaosvolt]

Purpose of change

A lil thing that was requested a while back, this allows hosing someone down (including yourself) with a fire extinguisher to also fix being on fire, instead of leaving you to continue patting yourself down and only fixing the ground being on fire.

Describe the solution

In iuse.cpp, added a section to iuse::extinguisher that checks if a creature of any sort is present in the targeted tile after affecting fields and blinding monsters, then removing the on fire status if present on them.

Describe alternatives you've considered

Procrastinating even more.

Testing

1. Compiled and load-tested.
2. Spawned myself in some fire and used extinguisher on myself afterward, puts myself out now in addition to removing the fire.
3. Repeated this on my starter NPC, likewise they're put out by it.
4. Lit up a tough zombie (had to use raging fire specifically to confirm they'd show as extinguished) then hit them with a dose of the extinguisher, it blinds them as well as putting out the fire both on the ground and on them.
5. Checked affected file for astyle.

Additional context

Checklist

[Lamandus]

ah yes. !!SCIENCE!!

[scarf005]