Refactors armor into dedicated subtypes (#71986)

## About The Pull Request

See title.
## Why It's Good For The Game

Code is cleaner, and more readable/intuitive
Technically closes
https://github.com/tgstation/dev-cycles-initiative/issues/8
## Changelog
🆑
refactor: armor, from the ground up basically
/🆑

Co-authored-by: Mothblocks <35135081+Mothblocks@users.noreply.github.com>

code/game/objects/structures/plasticflaps.dm

@@ -4,7 +4,7 @@
 	gender = PLURAL
 	icon = 'icons/obj/stationobjs.dmi'
 	icon_state = "plasticflaps"
-	armor = list(MELEE = 100, BULLET = 80, LASER = 80, ENERGY = 100, BOMB = 50, BIO = 0, FIRE = 50, ACID = 50)
+	armor_type = /datum/armor/structure_plasticflaps
 	density = FALSE
 	anchored = TRUE
 	can_atmos_pass = ATMOS_PASS_NO
@@ -13,6 +13,15 @@
 /obj/structure/plasticflaps/opaque
 	opacity = TRUE
 
+/datum/armor/structure_plasticflaps
+	melee = 100
+	bullet = 80
+	laser = 80
+	energy = 100
+	bomb = 50
+	fire = 50
+	acid = 50
+
 /obj/structure/plasticflaps/Initialize(mapload)
 	. = ..()
 	alpha = 0