Change throwable extinguisher to perish after use

[artur-kink]

Summary

SUMMARY: Bugfixes "Change throwable extinguisher to perish after use"

Purpose of change

A throw_extinguisher activates when thrown into fire.
The activation lowers fire intensity and deactivates the extinguisher.
The extinguisher remains where it was thrown, and can be picked up and reused indefinitely.
Since the throwable extinguisher is described as a 'grenade', I think it should not be reusable.

Describe the solution

Removes the throwable extinguisher if it is activated in fire.
Also increase the effect a tiny bit to make it more useful.

[BevapDin]

The return value of the iuse function indicates whether the item should be deleted. This used to work fine. Returning X here means to remove X item / charges that was used up (and returning 0 means to consume 0 items / charges).

I suspect removing the item manually here and return 1 will lead to bugs as the calling code will attempt to remove the item as well (but it isn't there anymore).

[artur-kink]

You're right using i_rem is not a good solution. Although in this case process_tool does not try to double remove the item since it has no energy. I've switched it to work just like acidbomb_act which is also an un-activate-able item that is destroyed when thrown.