Allows us to drop NODROP items if there is other way to get rid of them (#21080)

* adds proc to check if we can drop nodrop items

* C:/Program Files/Git/obj/effect/proc_holder/spell/touch refactor, support for wizard spells, xeno spells and changeling shield

* bug fixes, cleanup

* moved to signals, added support for mime fingergun

* fixed bugs

* cleanup

* same proc for removing weapon from active or any hand

* changeling fast swap exist again

* cleanup

* fix runtime

* signals cleanup

* review update

* Update code/datums/spells/mime.dm

Co-authored-by: Ryan <80364400+Sirryan2002@users.noreply.github.com>

* Update code/datums/spells/mime.dm

Co-authored-by: Ryan <80364400+Sirryan2002@users.noreply.github.com>

* Update code/datums/spells/touch_attacks.dm

Co-authored-by: Ryan <80364400+Sirryan2002@users.noreply.github.com>

* review updates

* fixing bug

---------

Co-authored-by: Ryan <80364400+Sirryan2002@users.noreply.github.com>

code/datums/spells/mime.dm

@@ -99,17 +99,32 @@
 	action_icon_state = "fingergun"
 	action_background_icon_state = "bg_mime"
 	var/gun = /obj/item/gun/projectile/revolver/fingergun
+	var/obj/item/gun/projectile/revolver/fingergun/current_gun
 
 /obj/effect/proc_holder/spell/mime/fingergun/cast(list/targets, mob/user = usr)
 	for(var/mob/living/carbon/human/C in targets)
-		if(!istype(C.get_active_hand(), gun) && !istype(C.get_inactive_hand(), gun))
+		if(!current_gun)
 			to_chat(user, "<span class='notice'>You draw your fingers!</span>")
+			current_gun = new gun(get_turf(user), src)
 			C.drop_item()
-			C.put_in_hands(new gun)
+			C.put_in_hands(current_gun)
+			RegisterSignal(C, COMSIG_MOB_WILLINGLY_DROP, PROC_REF(holster_hand))
 		else
-			to_chat(user, "<span class='notice'>Holster your fingers first.</span>")
+			holster_hand(user, TRUE)
 			revert_cast(user)
 
+
+/obj/effect/proc_holder/spell/mime/fingergun/Destroy()
+	current_gun = null
+	return ..()
+
+/obj/effect/proc_holder/spell/mime/fingergun/proc/holster_hand(atom/target, any=FALSE)
+	SIGNAL_HANDLER
+	if(!current_gun || !any && action.owner.get_active_hand() != current_gun)
+		return
+	to_chat(action.owner, "<span class='notice'>You holster your fingers. Another time perhaps...</span>")
+	QDEL_NULL(current_gun)
+
 /obj/effect/proc_holder/spell/mime/fingergun/fake
 	desc = "Pretend you're shooting bullets out of your fingers! 3 bullets available per cast. Use your fingers to holster them manually."
 	gun = /obj/item/gun/projectile/revolver/fingergun/fake