Chest pouch bag and new storage belts. (#21233)

Adds a new type of bag and two new storage belts. Also fixes being
unable to flip belts.
<img width="89" height="111" alt="image"
src="https://github.com/user-attachments/assets/6b1ec387-2f8d-4f70-a8f1-ab1d8e4b5ed8"
/>
<img width="88" height="87" alt="image"
src="https://github.com/user-attachments/assets/35a04494-7d83-4804-b1b8-9ac1be538e34"
/>
<img width="75" height="95" alt="image"
src="https://github.com/user-attachments/assets/7d1e97e4-f1e8-4e0e-8d4f-6ec0cb8e1253"
/>
<img width="89" height="86" alt="image"
src="https://github.com/user-attachments/assets/402451e7-42fc-4ed1-a73f-23dfafc0a360"
/>



### Asset Licenses
The following assets that **have not** been created by myself are
included in this PR:

Sprites are by RatFromTheJungle, from this PR
https://github.com/NovaSector/NovaSector/pull/4651

---------

Signed-off-by: Greenjoe12345 <33647525+Greenjoe12345@users.noreply.github.com>

code/datums/outfits/outfit.dm

@@ -75,6 +75,8 @@
 	var/rucksack_faction
 	var/pocketbook = /obj/item/storage/backpack/satchel/pocketbook
 	var/pocketbook_faction
+	var/chestpouch = /obj/item/storage/backpack/chestpouch
+	var/chestpouch_faction
 
 	var/allow_pda_choice = FALSE
 	var/tab_pda = /obj/item/modular_computer/handheld/pda/civilian
@@ -235,6 +237,14 @@
 						back = /obj/item/storage/backpack/satchel/pocketbook
 					if (OUTFIT_FACTIONSPECIFIC)
 						back = pocketbook_faction ? pocketbook_faction : pocketbook
+			if (OUTFIT_CHESTPOUCH)
+				switch(H.backbag_style)
+					if (OUTFIT_JOBSPECIFIC)
+						back = chestpouch
+					if (OUTFIT_GENERIC)
+						back = /obj/item/storage/backpack/chestpouch
+					if (OUTFIT_FACTIONSPECIFIC)
+						back = chestpouch_faction ? chestpouch_faction : chestpouch
 			else
 				// Department backpack
 				back = backpack