Bandolier auto-loading (#3324)

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## About The Pull Request

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merging your PR! -->

Bandoliers can now be loaded similarly to a magazine by using an ammo
box on it.

Adds an examine hint for this behavior.

## Why It's Good For The Game

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benefit the game. If you can't justify it in words, it might not be
worth adding. -->

QOL change, Streamlines loading the bandolier so you don't need to click
at minimum 80 times to manually hand load 40 rounds into your bandolier.

## Changelog

:cl:
add: Bandolier auto-loading and examine hint
/:cl:

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code/game/objects/items/storage/belt.dm

@@ -681,7 +681,7 @@
 
 /obj/item/storage/belt/bandolier
 	name = "bandolier"
-	desc = "A bandolier for holding ammunition. Does not hold magazines"
+	desc = "A bandolier for holding ammunition. Does not hold magazines."
 	icon_state = "bandolier"
 	item_state = "bandolier"
 
@@ -695,6 +695,10 @@
 		/obj/item/ammo_casing
 		))
 
+/obj/item/storage/belt/bandolier/examine(mob/user)
+	. = ..()
+	. += span_notice("The bandolier can be directly loaded by clicking on it with an ammo box.")
+
 /obj/item/storage/belt/fannypack
 	name = "fannypack"
 	desc = "A dorky fannypack for keeping small items in."

code/modules/projectiles/boxes_magazines/_box_magazine.dm

@@ -125,6 +125,26 @@
 			to_chat(user, "<span class='notice'>You load [num_loaded] cartridge\s into \the [src]!</span>")
 	return num_loaded
 
+/obj/item/ammo_box/afterattack(atom/target, mob/user, proximity_flag, click_parameters)
+	. = ..()
+	var/num_loaded = 0
+	var/obj/item/storage/belt/bandolier/to_load
+	if(istype(target,/obj/item/storage/belt/bandolier))
+		to_load = target
+		var/datum/component/storage/storage_to_load = to_load.GetComponent(/datum/component/storage)
+		for(var/obj/item/ammo_casing/casing_to_insert in stored_ammo)
+			if(!((to_load.contents.len >= storage_to_load.get_max_volume()) || do_after(user, 0.5 SECONDS, src)))
+				break
+			if(!storage_to_load.can_be_inserted(casing_to_insert,TRUE,user))
+				break
+			storage_to_load.handle_item_insertion(casing_to_insert,TRUE,user)
+			stored_ammo -= casing_to_insert
+			playsound(get_turf(src), 'sound/weapons/gun/general/mag_bullet_insert.ogg', 60, TRUE)
+			num_loaded++
+			update_ammo_count()
+	if(num_loaded)
+		to_chat(user, "<span class='notice'>You load [num_loaded] cartridge\s into \the [to_load]!</span>")
+	return
 /obj/item/ammo_box/attack_self(mob/user)
 	var/obj/item/ammo_casing/A = get_round()
 	if(!A)