Adds an universal object health system. (#21266)

https://www.youtube.com/watch?v=ZpUYjpKg9KY

As per title. The goal is to add health to most objects in the game and
thus allow them to be dynamically destructible, while also avoiding
shitcode like each structure having its own snowflake health update
proc.

---------

Signed-off-by: Matt Atlas <mattiathebest2000@hotmail.it>
Co-authored-by: Matt Atlas <liermattia@gmail.com>
Co-authored-by: SleepyGemmy <99297919+SleepyGemmy@users.noreply.github.com>

code/game/objects/items/weapons/storage/boxes.dm

@@ -29,6 +29,7 @@
 	icon_state = "box"
 	item_state = "box"
 	contained_sprite = TRUE
+	maxhealth = OBJECT_HEALTH_EXTREMELY_LOW
 	color = COLOR_CARDBOARD
 	var/label = "label"
 	var/illustration = "writing"
@@ -39,19 +40,17 @@
 	///Boolean, if set, can be crushed into a trash item when empty
 	var/trash = null
 
-	var/maxHealth = 20	//health is already defined
 	use_sound = 'sound/items/storage/box.ogg'
 	drop_sound = 'sound/items/drop/cardboardbox.ogg'
 	pickup_sound = 'sound/items/pickup/cardboardbox.ogg'
 	var/chewable = TRUE
 
-/obj/item/storage/box/condition_hints(mob/user, distance, is_adjacent)
-	. += ..()
-	if (health < maxHealth)
-		if (health >= (maxHealth * 0.5))
-			. += SPAN_WARNING("It is slightly torn.")
+/obj/item/storage/box/get_damage_condition_hints(mob/user, distance, is_adjacent)
+	if (health < maxhealth)
+		if (health >= (maxhealth * 0.5))
+			. = SPAN_WARNING("It is slightly torn.")
 		else
-			. += SPAN_DANGER("It is full of tears and holes.")
+			. = SPAN_DANGER("It is full of tears and holes.")
 
 /obj/item/storage/box/mechanics_hints(mob/user, distance, is_adjacent)
 	. += ..()
@@ -74,7 +73,8 @@
 
 /obj/item/storage/box/Initialize()
 	. = ..()
-	health = maxHealth
+	if(illustration)
+		AddOverlays(illustration)
 	update_icon()
 
 /obj/item/storage/box/proc/damage(var/severity)

code/game/objects/items/weapons/storage/fancy.dm

@@ -556,7 +556,6 @@
 		/obj/item/reagent_containers/food/snacks/truffle/random
 	)
 	starts_with = list(/obj/item/reagent_containers/food/snacks/truffle/random = 8)
-	maxHealth = 40
 
 /obj/item/storage/box/fancy/chocolate_box/fill()
 	for(var/i=1; i <= storage_slots; i++)

code/game/objects/items/weapons/weaponry.dm

@@ -44,7 +44,8 @@
 	anchored = TRUE
 	mouse_opacity = MOUSE_OPACITY_ICON
 
-	var/health = 50
+	maxhealth = OBJECT_HEALTH_VERY_LOW
+
 	var/mob/living/affecting = null //Who it is currently affecting, if anyone.
 
 /obj/effect/energy_net/Initialize()