Revamps limb-loss code (#16803)

* Revamps limb-loss code

- Makes it so everyone isn't at squishy as necromorphs
- Adds in a threshold for 'how damaged this limb needs to be prior' UNLESS you are dealing MASS DAMAGE to the limb, in which case it needs to be >1/2 the limb's hp (NOTE, GREATER THAN, NOT >=. This means the Eblade can not 1hit arms/legs)
-Vital limbs divide damage recieved by 1.5x making it harder for them to hit the threshold to actually take vital limbs off.
- When limbs enter 'critical state' (They were already at max damage and has been damaged even further) they are 3x more likely to get chopped off.

- Projectiles are WAY too strong and have been WAY too powercrept. Damage dealt by them is divided by 1/2 for all of limbcode, meaning a 60 damage revolver is the equivalent of being hit by a 30 damage attack. If this is dealt to the head,  this is the equivalent of being hit by a 20 damage attack. (no delimb)

- Fixes a bug where sharp weapons were TRIPLE DIPPING their delimb chance.

- Gets rid of brute weapon tearoff. They ONLY have the gib chance now.

- Chances for objects removing your limbs has been HEAVILY lowered.

* I guess mobs get projectile as well now

code/modules/mob/living/carbon/human/human_damage.dm

@@ -464,10 +464,9 @@ This function restores all organs.
 	return organs_by_name[zone]
 */
 
-/mob/living/carbon/human/apply_damage(var/damage = 0, var/damagetype = BRUTE, var/def_zone = null, var/blocked = 0, var/soaked = 0, var/sharp = FALSE, var/edge = FALSE, var/obj/used_weapon = null)
+/mob/living/carbon/human/apply_damage(var/damage = 0, var/damagetype = BRUTE, var/def_zone = null, var/blocked = 0, var/soaked = 0, var/sharp = FALSE, var/edge = FALSE, var/obj/used_weapon = null, var/projectile = FALSE)
 	if(Debug2)
 		to_world_log("## DEBUG: human/apply_damage() was called on [src], with [damage] damage, an armor value of [blocked], and a soak value of [soaked].")
-
 	var/obj/item/organ/external/organ = null
 	if(isorgan(def_zone))
 		organ = def_zone
@@ -568,7 +567,7 @@ This function restores all organs.
 						M.energy_source.use(M.damage_cost*damage)
 					damage *= M.incoming_brute_damage_percent
 
-			if(organ.take_damage(damage, 0, sharp, edge, used_weapon))
+			if(organ.take_damage(damage, 0, sharp, edge, used_weapon, projectile=projectile))
 				UpdateDamageIcon()
 		if(BURN)
 			damageoverlaytemp = 20
@@ -585,7 +584,7 @@ This function restores all organs.
 						M.energy_source.use(M.damage_cost*damage)
 					damage *= M.incoming_fire_damage_percent
 
-			if(organ.take_damage(0, damage, sharp, edge, used_weapon))
+			if(organ.take_damage(0, damage, sharp, edge, used_weapon, projectile=projectile))
 				UpdateDamageIcon()
 
 	// Will set our damageoverlay icon to the next level, which will then be set back to the normal level the next mob.Life().

code/modules/mob/living/damage_procs.dm

@@ -8,7 +8,7 @@
 	Returns
 	standard 0 if fail
 */
-/mob/living/proc/apply_damage(var/damage = 0,var/damagetype = BRUTE, var/def_zone = null, var/blocked = 0, var/soaked = 0, var/used_weapon = null, var/sharp = FALSE, var/edge = FALSE, var/obj/used_weapon = null)
+/mob/living/proc/apply_damage(var/damage = 0,var/damagetype = BRUTE, var/def_zone = null, var/blocked = 0, var/soaked = 0, var/used_weapon = null, var/sharp = FALSE, var/edge = FALSE, var/obj/used_weapon = null, var/projectile = 0)
 	if(Debug2)
 		to_world_log("## DEBUG: apply_damage() was called on [src], with [damage] damage, and an armor value of [blocked].")
 	if(!damage || (blocked >= 100))

code/modules/mob/living/living_defense.dm

@@ -122,12 +122,12 @@
 	if(P.taser_effect)
 		stun_effect_act(0, P.agony, def_zone, P)
 		if(!P.nodamage)
-			apply_damage(P.damage, P.damage_type, def_zone, absorb, soaked, 0, P, sharp=proj_sharp, edge=proj_edge)
+			apply_damage(P.damage, P.damage_type, def_zone, absorb, soaked, 0, P, sharp=proj_sharp, edge=proj_edge, projectile=TRUE)
 		qdel(P)
 		return
 
 	if(!P.nodamage)
-		apply_damage(P.damage, P.damage_type, def_zone, absorb, soaked, 0, P, sharp=proj_sharp, edge=proj_edge)
+		apply_damage(P.damage, P.damage_type, def_zone, absorb, soaked, 0, P, sharp=proj_sharp, edge=proj_edge, projectile=TRUE)
 	P.on_hit(src, absorb, soaked, def_zone)
 
 	if(absorb == 100)