Tweaks some nuclear agent items (#22119)

* First changes

* Dont forget to do cooldown shit

* I HATE PEOPLE AAAAA

* Defib almost done

* Okay we ball

* Defib done

* I hate bullets

* Sniper done

* More stamina damage

* GDN review + Oops I forgor this

* Update code/datums/components/defibrillator.dm

Co-authored-by: Henri215 <77684085+Henri215@users.noreply.github.com>

* Disintegrate go brrrr

* Lewc review

* Ghhhhh

* Final oopsie fixed

* Almost made an oopsie daisy myself

---------

Co-authored-by: Henri215 <77684085+Henri215@users.noreply.github.com>

code/modules/projectiles/guns/projectile/sniper.dm

@@ -158,7 +158,6 @@
 	name = "penetrator round"
 	damage = 60
 	forcedodge = -1
-	dismemberment = 0
 	weaken = 0
 
 //toy magazine

code/modules/projectiles/projectile/bullets.dm

@@ -140,7 +140,7 @@
 
 /obj/item/projectile/bullet/midbullet
 	damage = 20
-	stamina = 65 //two rounds from the c20r knocks people down
+	stamina = 45 // Three rounds from the c20r knocks unarmoured people down, four for people with bulletproof
 
 /obj/item/projectile/bullet/midbullet_r
 	damage = 5