Prevents spamming open and close tarps (#3768)

# About the pull request

Fixes #3734
Deals with exploit that allows the user to spam open and close a tarp,
making it hard for the Xeno to hit the marine, this makes it so when
tarp is opened, 3 seconds must pass before it can be closed again. If 3
seconds isn't enough, delay can be lengthened.

# Explain why it's good for the game

I was tasked by the Xeno Agents to buff Xeno win rate by any means
necessary, including fixing exploits.

# Testing Photographs and Procedure
<details>
<summary>Screenshots & Videos</summary>


https://github.com/cmss13-devs/cmss13/assets/91219575/999e0f72-a802-41d3-b1d8-5a4569d84e5a

Before


![image](https://github.com/cmss13-devs/cmss13/assets/91219575/7eb71b25-4077-4042-bab6-760f0c429190)
After

</details>


# Changelog
:cl:
fix: fixes exploit relating to cloaking tarps by adding a delay before
tarp can be closed again.
/:cl:

---------

Co-authored-by: harryob <[email protected]>

code/game/objects/structures/crates_lockers/closets.dm

@@ -149,7 +149,7 @@
 
 /obj/structure/closet/proc/toggle(mob/living/user)
 	user.next_move = world.time + 5
-	if(!(src.opened ? src.close() : src.open()))
+	if(!(src.opened ? src.close(user) : src.open()))
 		to_chat(user, SPAN_NOTICE("It won't budge!"))
 	return
 

code/modules/cm_marines/equipment/gear.dm

@@ -58,6 +58,8 @@
 	var/is_animating = FALSE
 	var/first_open = TRUE
 	exit_stun = 0
+	/// used to implement a delay before tarp can be entered again after opened (anti-exploit)
+	COOLDOWN_DECLARE(toggle_delay)
 
 /obj/structure/closet/bodybag/tarp/snow
 	icon_state = "snowtarp_closed"
@@ -91,9 +93,9 @@
 	exit_stun = 1
 	can_store_dead = TRUE
 
-/obj/structure/closet/bodybag/tarp/reactive/scout/close()
+/obj/structure/closet/bodybag/tarp/reactive/scout/close(mob/user)
 	if(!skillcheck(usr, SKILL_SPEC_WEAPONS, SKILL_SPEC_ALL) && usr.skills.get_skill_level(SKILL_SPEC_WEAPONS) != SKILL_SPEC_SCOUT)
-		to_chat(usr, SPAN_WARNING("You don't seem to know how to use [src]..."))
+		to_chat(user, SPAN_WARNING("You don't seem to know how to use [src]..."))
 		return
 	. = ..()
 
@@ -137,10 +139,14 @@
 			return
 
 /obj/structure/closet/bodybag/tarp/open()
+	COOLDOWN_START(src, toggle_delay, 3 SECONDS) //3 seconds must pass before tarp can be closed
 	. = ..()
 	handle_cloaking()
 
-/obj/structure/closet/bodybag/tarp/close()
+/obj/structure/closet/bodybag/tarp/close(mob/user)
+	if(!COOLDOWN_FINISHED(src, toggle_delay))
+		to_chat(user, SPAN_WARNING("It is too soon to close [src]!"))
+		return FALSE
 	. = ..()
 	handle_cloaking()