Adds a scaling direct hit sound to the XM88 (#5117)

# About the pull request

Adds a scaling impact sound for every direct hit you obtain with the
XM88, depending on the current penetration value.

# Explain why it's good for the game

The bullseye mechanic makes this weapon very, very powerful. However,
you don't really feel like you're doing any more damage with it. The
XM88 doesn't really give the user any proper feedback if they're
managing to nail several direct hits. A good sound effect can give them
a dopamine rush, and in turn, make the weapon more fun to use.

# Testing Photographs and Procedure
<details>
<summary>Screenshots & Videos</summary>



https://github.com/cmss13-devs/cmss13/assets/17518895/555995ab-74ef-4174-ac71-0f5eecbead3f



</details>


# Changelog
:cl:
soundadd: The XM88 now has a scaling hit sound for every direct hit you
manage to land with it.
/:cl:

code/modules/projectiles/guns/lever_action.dm

@@ -373,6 +373,7 @@ their unique feature is that a direct hit will buff your damage and firerate
 	hit_buff_reset_cooldown = 2 SECONDS //how much time after a direct hit until streaks reset
 	var/floating_penetration = FLOATING_PENETRATION_TIER_0 //holder var
 	var/floating_penetration_upper_limit = FLOATING_PENETRATION_TIER_4
+	var/direct_hit_sound = 'sound/weapons/gun_xm88_directhit_low.ogg'
 	attachable_allowed = list(
 		/obj/item/attachable/bayonet/upp, // Barrel
 		/obj/item/attachable/bayonet,
@@ -499,12 +500,16 @@ their unique feature is that a direct hit will buff your damage and firerate
 		switch(floating_penetration)
 			if(FLOATING_PENETRATION_TIER_1)
 				P.ammo = GLOB.ammo_list[/datum/ammo/bullet/lever_action/xm88/pen20]
+				direct_hit_sound = "sound/weapons/gun_xm88_directhit_low.ogg"
 			if(FLOATING_PENETRATION_TIER_2)
 				P.ammo = GLOB.ammo_list[/datum/ammo/bullet/lever_action/xm88/pen30]
+				direct_hit_sound = "sound/weapons/gun_xm88_directhit_medium.ogg"
 			if(FLOATING_PENETRATION_TIER_3)
 				P.ammo = GLOB.ammo_list[/datum/ammo/bullet/lever_action/xm88/pen40]
+				direct_hit_sound = "sound/weapons/gun_xm88_directhit_medium.ogg"
 			if(FLOATING_PENETRATION_TIER_4)
 				P.ammo = GLOB.ammo_list[/datum/ammo/bullet/lever_action/xm88/pen50]
+				direct_hit_sound = "sound/weapons/gun_xm88_directhit_high.ogg"
 	return ..()
 
 /obj/item/weapon/gun/lever_action/xm88/unload(mob/user)
@@ -524,6 +529,7 @@ their unique feature is that a direct hit will buff your damage and firerate
 	lever_message = initial(lever_message)
 	wield_delay = initial(wield_delay)
 	cur_onehand_chance = initial(cur_onehand_chance)
+	direct_hit_sound = "sound/weapons/gun_xm88_directhit_low.ogg"
 	if(in_chamber)
 		var/obj/projectile/P = in_chamber
 		P.ammo = GLOB.ammo_list[/datum/ammo/bullet/lever_action/xm88]
@@ -536,6 +542,10 @@ their unique feature is that a direct hit will buff your damage and firerate
 	if(one_hand_lever)
 		addtimer(VARSET_CALLBACK(src, cur_onehand_chance, reset_onehand_chance), 4 SECONDS, TIMER_OVERRIDE|TIMER_UNIQUE)
 
+/obj/item/weapon/gun/lever_action/xm88/direct_hit_buff(mob/user, mob/target, one_hand_lever = FALSE)
+	. = ..()
+	playsound(target, direct_hit_sound, 75)
+
 #undef FLOATING_PENETRATION_TIER_0
 #undef FLOATING_PENETRATION_TIER_1
 #undef FLOATING_PENETRATION_TIER_2