Guns sounds refactor and improvements (#5803)

* Gun sound updates

Grenade Launcher sound source:
https://freesound.org/people/LeMudCrab/sounds/163458/

* Actually, this is a better way to handle this.

* Fixed accidental inconsistent indentation

* Renames shotgun.ogg to Gunshot_shotgun.ogg

Also actually changes the file names like I was supposed to last night.

* *peers* Didn't I just fix this shit?

* Actually fixes the missing files this time

* Update audible_deception.dm

* Changed tungsten core projectile sound by request

* Actually no this line is stupid and makes me angry

Simplifies dumb code that was badly copypasted.

Also fixed missing D'eagle fire_sound

* Smarter code

Less copypasta, more runtimes prevented in case somebody decides to make
a soundless gun whether done intentionally or not.

* Update gun.dm

code/modules/flufftext/Hallucination.dm

@@ -124,9 +124,9 @@ mob/living/carbon/proc/handle_hallucinations()
 					if(8) src << 'sound/machines/windowdoor.ogg'
 					if(9)
 						//To make it more realistic, I added two gunshots (enough to kill)
-						src << 'sound/weapons/Gunshot.ogg'
+						src << 'sound/weapons/Gunshot1.ogg'
 						spawn(rand(10,30))
-							src << 'sound/weapons/Gunshot.ogg'
+							src << 'sound/weapons/Gunshot2.ogg'
 					if(10) src << 'sound/weapons/smash.ogg'
 					if(11)
 						//Same as above, but with tasers.