Added screen alerts (#22051)

Ports screen alerts from CM13. This enables an immediate reference to
whether you are cuffed or buckled. It also provides an easy way to get
out of said situation by simply clicking on the alert.

<img width="430" height="454" alt="image"
src="https://github.com/user-attachments/assets/0c20abf2-0901-49e0-ac29-492ba7c6dbe5"
/>


### Asset Licenses
The following assets that **have not** been created by myself are
included in this PR:

| Path | Original Author | License |
| --- | --- | --- |
| icons/mob/screen_alert.dmi (buckle, succumb) | CM13Devs (CM-13) |
CC-BY-SA 3.0 |

code/game/objects/items/tools/tools.dm

@@ -195,9 +195,7 @@
 		SPAN_NOTICE("You cut \the [C]'s restraints with \the [src]!"),\
 		SPAN_NOTICE("You hear cable being cut."))
 		C.handcuffed = null
-		if(C.buckled_to?.buckle_require_restraints)
-			C.buckled_to.unbuckle()
-		C.update_inv_handcuffed()
+		C.handcuff_update()
 		return
 	else
 		..()

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

@@ -97,10 +97,6 @@
 		user.do_attack_animation(H)
 		user.visible_message(SPAN_DANGER("\The [user] has put [cuff_type] on \the [H]!"))
 
-	if(!legcuff)
-		target.drop_r_hand()
-		target.drop_l_hand()
-
 	// Apply cuffs.
 	var/obj/item/handcuffs/cuffs = src
 	if(dispenser)
@@ -112,10 +108,10 @@
 
 	if(!legcuff)
 		target.handcuffed = cuffs
-		target.update_inv_handcuffed()
+		target.handcuff_update()
 	else
 		target.legcuffed = cuffs
-		target.update_inv_legcuffed()
+		target.legcuff_update()
 	return TRUE
 
 /mob/living/carbon/human/RestrainedClickOn(var/atom/A)

code/game/objects/items/weapons/implants/implants/freedom.dm

@@ -29,9 +29,7 @@
 		if(C_imp_in.handcuffed)
 			var/obj/item/W = C_imp_in.handcuffed
 			C_imp_in.handcuffed = null
-			if(C_imp_in.buckled_to && C_imp_in.buckled_to.buckle_require_restraints)
-				C_imp_in.buckled_to.unbuckle()
-			C_imp_in.update_inv_handcuffed()
+			C_imp_in.handcuff_update()
 			if(C_imp_in.client)
 				C_imp_in.client.screen -= W
 			if(W)
@@ -42,7 +40,7 @@
 		if(C_imp_in.legcuffed)
 			var/obj/item/W = C_imp_in.legcuffed
 			C_imp_in.legcuffed = null
-			C_imp_in.update_inv_legcuffed()
+			C_imp_in.legcuff_update()
 			if(C_imp_in.client)
 				C_imp_in.client.screen -= W
 			if(W)