Belts & Trashbags (#7443)

requires #6644 

Entirely replaces how (most) belts perform insertion checks.

This pretty much allows belts to hold most things.

Armor vests are next.

Trashbags will also use the systems we use on main.

Closes #7256 and #7435

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Co-authored-by: silicons <silicons@silicons.dev>

code/modules/projectiles/ammunition/ammo_casing.dm

@@ -9,6 +9,8 @@
 	w_class = WEIGHT_CLASS_TINY
 	drop_sound = 'sound/items/drop/ring.ogg'
 	pickup_sound = 'sound/items/pickup/ring.ogg'
+	belt_storage_class = BELT_CLASS_SMALL
+	belt_storage_size = BELT_SIZE_FOR_AMMO_CASING
 	weight_volume = ITEM_VOLUME_AMMO_CASING
 
 	//* Casing *//

code/modules/projectiles/ammunition/ammo_magazine.dm

@@ -11,6 +11,8 @@
 	item_flags = ITEM_EASY_LATHE_DECONSTRUCT | ITEM_ENCUMBERS_WHILE_HELD
 	slot_flags = SLOT_BELT
 	suit_storage_class = SUIT_STORAGE_CLASS_SOFTWEAR | SUIT_STORAGE_CLASS_HARDWEAR
+	belt_storage_class = BELT_CLASS_MEDIUM
+	belt_storage_size = BELT_SIZE_FOR_MAGAZINE
 
 	icon = 'icons/system/error_32x32.dmi'
 	inhand_state = "syringe_kit"

code/modules/projectiles/guns/gun.dm

@@ -50,6 +50,7 @@
 	item_state = "gun"
 	item_flags = ITEM_ENCUMBERS_WHILE_HELD | ITEM_ENCUMBERS_ONLY_HELD
 	slot_flags = SLOT_BELT|SLOT_HOLSTER
+	belt_storage_class = BELT_CLASS_LARGE
 	// Fuck it YOLO guns go everywhere now because it's pointless arguing at this point, maybe this'll be re-evaluated later.
 	suit_storage_class = SUIT_STORAGE_CLASS_SOFTWEAR | SUIT_STORAGE_CLASS_HARDWEAR | SUIT_STORAGE_CLASS_ARMOR
 	materials_base = list(MAT_STEEL = 2000)