Adds a tram collision indicator board (#70812)

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## About The Pull Request
Based off the delamination counter, adds a tram hit counter sign. Every
time the tram hits someone, a signal is sent and the sign increments.


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![tramhitcounter2](https://user-images.githubusercontent.com/83487515/197989631-eecbd50a-7f9e-4c19-9070-f88967a77a4a.gif)

## Why It's Good For The Game
Showing how many people have been hit by the tram is an amusing
statistic to display.
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## Changelog

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🆑 LT3
add: A tram collision counter has been added, hopefully encouraging
employees to be more careful. Don't become a statistic!
/🆑

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your name to the right of the first 🆑 if you want to overwrite your
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Co-authored-by: LemonInTheDark <58055496+LemonInTheDark@users.noreply.github.com>
Co-authored-by: Mothblocks <35135081+Mothblocks@users.noreply.github.com>

_maps/map_files/tramstation/tramstation.dmm

@@ -38867,6 +38867,10 @@
 /obj/effect/turf_decal/trimline/brown/filled/line,
 /turf/open/floor/iron,
 /area/station/cargo/drone_bay)
+"nRC" = (
+/obj/structure/sign/collision_counter,
+/turf/closed/wall,
+/area/station/medical/medbay/lobby)
 "nRO" = (
 /obj/effect/turf_decal/trimline/neutral/filled/line{
 	dir = 8
@@ -166703,7 +166707,7 @@ nbS
 tqy
 qjf
 vJF
-wyd
+nRC
 wyd
 rks
 rks

code/__DEFINES/dcs/signals/signals_tram.dm

@@ -3,3 +3,6 @@
 
 /// Sent from /obj/structure/industrial_lift/tram when it begins to travel. (obj/effect/landmark/tram/from_where, obj/effect/landmark/tram/to_where)
 #define COMSIG_TRAM_TRAVEL "tram_travel"
+
+/// Sent from /obj/structure/industrial_lift/tram when it hits someone: ()
+#define COMSIG_TRAM_COLLISION "tram_collided"

code/game/objects/structures/signs/signs_interactive.dm

@@ -82,3 +82,61 @@ MAPPING_DIRECTIONAL_HELPERS(/obj/structure/sign/delamination_counter, 32)
 			. += span_info("Good work!")
 		if(11 to INFINITY)
 			. += span_info("Incredible!")
+
+/obj/structure/sign/collision_counter
+	name = "incident counter"
+	sign_change_name = "Indicator board- Tram incidents"
+	desc = "A display that indicates how many tram related incidents have occured today."
+	icon_state = "tram_hits"
+	is_editable = TRUE
+	var/hit_count = 0
+	var/tram_id = TRAM_LIFT_ID
+
+/obj/structure/sign/collision_counter/Initialize(mapload)
+	..()
+	return INITIALIZE_HINT_LATELOAD
+
+/obj/structure/sign/collision_counter/LateInitialize()
+	. = ..()
+	for(var/obj/structure/industrial_lift/tram/tram as anything in GLOB.lifts)
+		if(tram.lift_id != tram_id)
+			continue
+		RegisterSignal(tram, COMSIG_TRAM_COLLISION, PROC_REF(new_hit))
+		update_appearance()
+
+/obj/structure/sign/collision_counter/Destroy()
+	return ..()
+
+/obj/structure/sign/collision_counter/proc/new_hit()
+	SIGNAL_HANDLER
+
+	hit_count++
+	update_appearance()
+
+/obj/structure/sign/collision_counter/update_overlays()
+	. = ..()
+
+	var/ones = hit_count % 10
+	var/mutable_appearance/ones_overlay = mutable_appearance('icons/obj/signs.dmi', "hits_[ones]")
+	ones_overlay.pixel_x = 4
+	. += ones_overlay
+
+	var/tens = (hit_count / 10) % 10
+	var/mutable_appearance/tens_overlay = mutable_appearance('icons/obj/signs.dmi', "hits_[tens]")
+	tens_overlay.pixel_x = -5
+	. += tens_overlay
+
+/obj/structure/sign/collision_counter/examine(mob/user)
+	. = ..()
+	. += span_info("The station has had [hit_count] incident\s this shift.")
+	switch (hit_count)
+		if(0)
+			. += span_info("Fantastic! Champions of safety.")
+		if(1)
+			. += span_info("Let's do better tomorrow.")
+		if(2 to 5)
+			. += span_info("There's room for improvement.")
+		if(6 to 10)
+			. += span_info("Good work! Nanotrasen's finest!")
+		if(11 to INFINITY)
+			. += span_info("Incredible! You're probably reading this from medbay.")

code/modules/industrial_lift/industrial_lift.dm

@@ -410,6 +410,8 @@ GLOBAL_LIST_EMPTY(lifts)
 				var/datum/callback/land_slam = new(collided, TYPE_PROC_REF(/mob/living/, tram_slam_land))
 				collided.throw_at(throw_target, 200 * collision_lethality, 4 * collision_lethality, callback = land_slam)
 
+				SEND_SIGNAL(src, COMSIG_TRAM_COLLISION)
+
 	unset_movement_registrations(exited_locs)
 	group_move(things_to_move, going)
 	set_movement_registrations(entering_locs)