Adds the "Limper" quirk (#96200)

## About The Pull Request

Adds a new negative quirk, called Limper. This quirk, as you could
probably guess, will make you limp. Specifically, the limp it gives you
is the same level as a compound fracture, so it's pretty significant.
Luckily, you spawn with a cane, which as long as you are holding you
won't be slowed down. This quirk is -6 points as it is pretty
significant (have to hold an item in one of your hands at all times,
losing this item makes you hella slow) but not quite as devastating as
other disability quirks.

code/datums/quirks/negative_quirks/limper.dm

@@ -0,0 +1,30 @@
+/datum/quirk/item_quirk/limper
+	name = "Limper"
+	desc = "You have a pronounced limp when you walk. This will slow you down considerably. Good thing you brought your cane."
+	icon = FA_ICON_PERSON_CANE
+	gain_text = span_danger("Your leg feels a bit weak.")
+	lose_text = span_notice("Your legs feel normal again.")
+	medical_record_text = "Patient appears to suffer from a weakness in the leg."
+	value = -6
+	hardcore_value = 3
+	quirk_flags = QUIRK_HUMAN_ONLY
+
+	mail_goodies = list(
+		/obj/item/cane,
+		/obj/item/cane/crutch,
+		/obj/item/cane/white,
+	)
+
+/datum/quirk/item_quirk/limper/add_unique(client/client_source)
+	give_item_to_holder(new /obj/item/cane(get_turf(quirk_holder)), list(
+			LOCATION_HANDS,
+			LOCATION_BACKPACK,
+		))
+	return
+
+/datum/quirk/item_quirk/limper/add(client/client_source)
+	quirk_holder.apply_status_effect(/datum/status_effect/limp/quirk)
+
+/datum/quirk/item_quirk/limper/remove(client/client_source)
+	quirk_holder.remove_status_effect(/datum/status_effect/limp/quirk)
+

code/datums/status_effects/wound_effects.dm

@@ -142,6 +142,31 @@
 		carbon_mob.remove_status_effect(src)
 		return
 
+//Quirk variant of limping. Will always be applied as long as you have a leg to stand on.
+/datum/status_effect/limp/quirk
+	id = "limp_quirk"
+	alert_type = null
+
+/datum/status_effect/limp/quirk/update_limp(datum/source)
+	var/mob/living/carbon/carbon_mob = owner
+	left = carbon_mob.get_bodypart(BODY_ZONE_L_LEG)
+	right = carbon_mob.get_bodypart(BODY_ZONE_R_LEG)	
+
+	slowdown_left = 0
+	slowdown_right = 0
+	limp_chance_left = 0
+	limp_chance_right = 0
+
+	
+	if(left)
+		slowdown_left = 7 //Same as compound fracture
+		limp_chance_left = 70
+
+	else if(right)
+		slowdown_right = 7
+		limp_chance_right = 70
+	
+
 /////////////////////////
 //////// WOUNDS /////////
 /////////////////////////