Adds a cooldown to aiming after shooting, also makes shooting while aiming drop the aim (#3271)

The cooldown is currently 3 seconds as suggested by this thread

also adds a nifty proc to Aiming to set said cool-down, it's variable.
The proc is "aim_cooldown(x)" with x being the time you want them unable to aim.

code/modules/projectiles/targeting/targeting_client.dm

@@ -1,12 +1,12 @@
 //These are called by the on-screen buttons, adjusting what the victim can and cannot do.
 /client/proc/add_gun_icons()
-	if(!usr) return 1 // This can runtime if someone manages to throw a gun out of their hand before the proc is called.
-	screen |= usr.item_use_icon
-	screen |= usr.gun_move_icon
-	screen |= usr.radio_use_icon
+	if(!mob) return 1 // This can runtime if someone manages to throw a gun out of their hand before the proc is called.
+	screen |= mob.item_use_icon
+	screen |= mob.gun_move_icon
+	screen |= mob.radio_use_icon
 
 /client/proc/remove_gun_icons()
-	if(!usr) return 1 // Runtime prevention on N00k agents spawning with SMG
-	screen -= usr.item_use_icon
-	screen -= usr.gun_move_icon
-	screen -= usr.radio_use_icon
+	if(!mob) return 1 // Runtime prevention on N00k agents spawning with SMG
+	screen -= mob.item_use_icon
+	screen -= mob.gun_move_icon
+	screen -= mob.radio_use_icon

code/modules/projectiles/targeting/targeting_mob.dm

@@ -5,7 +5,6 @@
 	set name = "Toggle Gun Mode"
 	set desc = "Begin or stop aiming."
 	set category = "IC"
-
 	if(isliving(src))
 		var/mob/living/M = src
 		if(!M.aiming)

code/modules/projectiles/targeting/targeting_overlay.dm

@@ -17,7 +17,7 @@
 	var/lock_time = 0          // When -will- we lock on?
 	var/active =    0          // Is our owner intending to take hostages?
 	var/target_permissions = 0 // Permission bitflags.
-
+	var/aimcooldown			   // How long untill we can re-aim?
 /obj/aiming_overlay/New(var/newowner)
 	..()
 	owner = newowner
@@ -133,6 +133,8 @@ obj/aiming_overlay/proc/update_aiming_deferred()
 			owner.set_dir(get_dir(get_turf(owner), get_turf(src)))
 
 /obj/aiming_overlay/proc/aim_at(var/mob/target, var/obj/thing)
+	if (aimcooldown > world.time)
+		return
 
 	if(!owner)
 		return
@@ -175,6 +177,9 @@ obj/aiming_overlay/proc/update_aiming_deferred()
 	moved_event.register(aiming_at, src, /obj/aiming_overlay/proc/target_moved)
 	destroyed_event.register(aiming_at, src, /obj/aiming_overlay/proc/cancel_aiming)
 
+/obj/aiming_overlay/proc/aim_cooldown(var/seconds)
+	aimcooldown = world.time + seconds SECONDS
+
 /obj/aiming_overlay/update_icon()
 	if(locked)
 		icon_state = "locked"
@@ -222,3 +227,4 @@ obj/aiming_overlay/proc/update_aiming_deferred()
 /obj/aiming_overlay/proc/target_moved()
 	update_aiming()
 	trigger(TARGET_CAN_MOVE)
+

code/modules/projectiles/targeting/targeting_triggers.dm

@@ -20,7 +20,12 @@
 	var/obj/item/weapon/gun/G = aiming_with
 	if(istype(G))
 		G.Fire(aiming_at, owner)
-
+	cancel_aiming()//if you can't remove it, nerf it
+	aim_cooldown(3)
+	toggle_active()
+	if (owner.client)
+		owner.client.remove_gun_icons()
+	
 /mob/living/ClickOn(var/atom/A, var/params)
 	. = ..()
 	trigger_aiming(TARGET_CAN_CLICK)